Kinetica has native support for a variety of expressions, which are used as inputs while querying data (for supported SQL expressions, see SQL Support ). These native expressions can involve one or more constants (both numeric and string) and table columns; however, expressions cannot be applied to storeonly columns. The expressions follow certain constraints based on where they are used, but all the expressions should follow the basic guidelines outlined below.
Important
Use parentheses liberally to ensure correct orderofoperations.
Constants
Types  Details 

String  String constants must be enclosed in single quotes or double quotes, e.g.,

Numerical  Numerical constants can be expressed as:

Date/Time  Supported date formats have optional leading zeros for months & days, while datetime optionally supports UTC format. Examples of each date/time data type:

Operators
When these operators are applied to numeric columns, they will interpret nonzero values as true and zero values as false, returning 1 for true and 0 for false.
Types  Details  

Bitwise  &  << >> ~ ^  
Comparison  > < >= <= == = != <> in
 
Logical 
 
Mathematical  +  * / 
Functions
Conditional Functions
Function  Description  

CASE(expr, {<matches>}, {<values>}, value_if_no_match)  Evaluates expr: returns the first value from the values list whose corresponding match from the matches list is equal to expr; returns value_if_no_match if expr is not equal to any of the matches in the matches list Note A null cannot be used for either a match or value, but value_if_no_match can be null.
Examples:
 
IF(expr, value_if_true, value_if_false)  Evaluates expr: if true, returns value_if_true; otherwise, if false or null, returns value_if_false; see ShortCircuiting for errorchecking details

Conversion Functions
For the CAST() and CONVERT() functions, valid destination types are:
Numeric  Text  Date/Time  Geometry 





Function  Description  

CAST(original value, destination type)  Returns the equivalent of original value converted to the destination type. Useful for converting strings to numbers and numbers to strings  
CHAR(int)  Returns the character associated with the ASCII code in int  
CHAR1(charN)  Converts the given charN to char1 type  
CHAR2(charN)  Converts the given charN to char2 type  
CHAR4(charN)  Converts the given charN to char4 type  
CHAR8(charN)  Converts the given charN to char8 type  
CHAR16(charN)  Converts the given charN to char16 type  
CHAR32(charN)  Converts the given charN to char32 type  
CHAR64(charN)  Converts the given charN to char64 type  
CHAR128(charN)  Converts the given charN to char128 type  
CHAR256(charN)  Converts the given charN to char256 type  
CONVERT(original value, destination type, style)  Returns the equivalent of original value converted to the destination type. The style parameter is currently only applicable when the destination type is string and the original value is of timestamp or datetime type. Valid style codes include:
Examples:
 
DATE(expr)  Converts expr to date (YYYYMMDD) format  
DATETIME(expr)  Converts expr to datetime (YYYYMMDD HH24:MI:SS.mmm) format  
STRING(expr)  Converts expr to a string format appropriate for the expr type  
TIME(expr)  Converts expr to time (HH:MI:SS.mmm) format  
TIMESTAMP(expr)  Converts expr to the number of milliseconds since the epoch  
TO_CHAR(expr, format)  Converts the given date/time expr to a string matching the given format. The format must be a string literalexpressions are not supported at this time. Arbitrary text can be injected into the format string using doublequotes. The returned string will be truncated at 32 characters. Valid format codes include:
Example:

Date/Time Functions
This section comprises the following functions:
 Date/Time Base Functions, which can extract parts of date/time expressions, convert back and forth between data types, and return the current date/time
 Date/Time Complex Conversion Functions, which can perform more complex date/type conversions
Date/Time Base Functions
Note
Integer fields are assumed to be seconds since the epoch; long/timestamp fields are assumed to be milliseconds since the epoch.
Function  Description  

CURRENT_DATE()  Returns the date as YYYYMMDD  
CURRENT_DATETIME()  Returns the date & time as YYYYMMDD HH24:MI:SS.mmm  
CURRENT_TIME()  Returns the time as HH24:MI:SS.mmm  
CURRENT_TIMESTAMP()  Returns the date & time as the number of milliseconds since the epoch  
DATEADD(unit, amount, expr)  Alias for TIMESTAMPADD(unit, amount, expr)  
DATEDIFF(expr_begin, expr_end)  Determines the difference between two dates, irrespective of time component, as the number of days when expr_begin is subtracted from expr_end; returns a negative number of days if expr_begin occurs after expr_end  
DAY(expr)  Alias for DAYOFMONTH(expr)  
DAYNAME(expr)  Extracts the day of the week from expr and converts it to the corresponding day name [Sunday  Saturday ]  
DAYOFMONTH(expr)  Extracts the day of the month from expr [1  31]  
DAYOFWEEK(expr)  Extracts the day of the week from expr [1  7]
 
DAY_OF_WEEK(expr)  Alias for DAYOFWEEK(expr)  
DAYOFYEAR(expr)  Extracts the day of the year from expr [1  366]  
DAY_OF_YEAR(expr)  Alias for DAYOFYEAR(expr)  
HOUR(expr)  Extracts the hour of the day from expr [0  23]  
LAST_DAY(expr)  Returns the date of the last day of the month in the given expr  
MINUTE(expr)  Extracts the minute of the day from expr [0  59]  
MONTH(expr)  Extracts the month of the year from expr [1  12]  
MONTHNAME(expr)  Extracts the month of the year from expr and converts it to the corresponding month name [ January  December]  
MSEC(expr)  Extracts the millisecond of the second from expr [0  999]  
NEXT_DAY(date, expr)  Returns the date of the next day of the week, provided as a day name in expr, that occurs after the given date Some examples, given that 20001010 is a Tuesday:
 
NOW()  Alias for CURRENT_DATETIME()  
QUARTER(expr)  Extracts the quarter of the year from expr [1  4]
 
SEC(expr)  Alias for SECOND(expr)  
SECOND(expr)  Extracts the seconds of the minute from expr [ 0  59 ]  
TIMEBOUNDARYDIFF(unit, begin, end)  Calculates the difference between two date/time expressions, returning the result as an integral difference in the units specified; more precisely, how many whole date/time intervals of type unit need to be added to (or subtracted from) begin to equal end up to the precision of the unit specified, using the unit types and rules specified in TIMESTAMPADD. For example, if unit were MONTH, only the year & month of begin and end would be used in the calculation; if unit were DAY, any time portion from begin & end would be dropped, and so on. This is unlike TIMESTAMPDIFF, which will consider the entirety of both begin & end in the calculation. Note This is symmetric with TIMESTAMPADD in all cases, as adding 1 MONTH to Mar 31st results in Apr 30th, and the TIMEBOUNDARYDIFF in MONTH units between those two dates is 1. Examples:
Important This function does not work with string literal date stamps (e.g., 20001231 12:34:56); to use string literals in this function, first cast them to the appropriate date/time type (e.g., DATETIME('YYYYMMDD HH24:MI:SS'))  
TIMESTAMPADD(unit, amount, expr)  Adds the positive or negative integral amount of unit date/time intervals to the date/time in expr The following date/time intervals are supported for unit:
Note Any of these unit types can have a SQL_TSI_ prefix prepended to them; e.g., both DAY and SQL_TSI_DAY are valid unit types for specifying a day interval. They may also be singlequoted or unquoted. Examples:
Note To cast the result to a string appropriate for the date/time type (e.g., YYYYMMDD HH24:MI:SS), pass the result to the STRING function (e.g., STRING(TIMESTAMPADD(HOUR, 12, '20001010 12:34:56')))  
TIMESTAMPDIFF(unit, begin, end)  Calculates the difference between two date/time expressions, returning the result as an integral difference in the units specified; more precisely, how many whole date/time intervals of type unit need to be added to (or subtracted from) begin to equal end (or get as close as possible without going past it) using the unit types and and rules specified in TIMESTAMPADD. Unlike TIMEBOUNDARYDIFF, all date/time components of both begin & end will be considered in the calculation, not just those that are up to the precision of unit. Note This is not symmetric with TIMESTAMPADD in all cases, as adding 1 MONTH to Mar 31st results in Apr 30th, but the TIMESTAMPDIFF in MONTH units between those two dates is 0. Examples:
Important This function does not work with string literal date stamps (e.g., 20001231 12:34:56); to use string literals in this function, first cast them to the appropriate date/time type (e.g., DATETIME('YYYYMMDD HH24:MI:SS'))  
WEEK(expr)  Extracts the week of the year from expr [1  54]; each full week starts on Sunday (A 1 is returned for the week containing Jan 1st)  
YEAR(expr)  Extracts the year from expr; 4digit year, A.D. 
Date/Time Complex Conversion Functions
Function  Description  

DATE_TO_EPOCH_MSECS(year, month, day, hour, min, sec, msec)  Converts the full date to the number of milliseconds since the epoch; negative values are accepted Example:
 
DATE_TO_EPOCH_SECS(year, month, day, hour, min, sec)  Converts the full date to the number of seconds since the epoch; negative values are accepted Example:
 
MSECS_SINCE_EPOCH(timestamp)  Converts the timestamp to the number of milliseconds since the epoch Example:
 
TIMESTAMP_FROM_DATE_TIME(date, time)  Converts the given date and time to a composite timestamp in milliseconds since the epoch Example:
 
WEEK_TO_EPOCH_MSECS(year, week_number)  Converts the year and week number to the number of milliseconds since the epoch; negative values are accepted Example:
 
WEEK_TO_EPOCH_SECS(year, week_number)  Converts the year and week number to the number of seconds since the epoch. Negative values are accepted. Each new week begins Sunday at midnight. Example:

ErrorChecking Functions
Errors will only be successfully caught if the expressions are floatingpoint types (i.e. double and float).
Function  Description  

IFERROR(expr, val)  Alias for IF_ERROR(expr, val)  
IFINF(expr, val)  Alias for IF_INF(expr, val)  
IFINFINITY(expr, val)  Alias for IF_INF(expr, val)  
IFNAN(expr, val)  Alias for IF_NAN(expr, val)  
IF_ERROR(expr, val)  Evaluates the given expr and if it resolves to infinity or NaN, return val Tip Conceptually, this function is the same as IF_INF(IF_NAN(expr, val), val) Example:
 
IF_INF(expr, val)  Evaluates the given expr and if it resolves to infinity, return val Example:
 
IF_INFINITY(expr, val)  Alias for IF_INF(expr, val)  
IF_NAN(expr, val)  Evaluates the given expr and if it resolves to NaN, return val Example:

Geospatial/Geometry Functions
Tip
 Use ST_ISVALID to determine if a geometry object is valid. The functions below work best with valid geometry objects.
 Use the REMOVE_NULLABLE function to remove any nullable column types that could result from calculating a derived column (e.g., as in Projections) using one of the functions below.
Enhanced Performance Scalar Functions
The functions below all compare x and y coordinates to geometry objects (or vice versa), thus increasing their performance in queries. Each of these functions have a geometrytogeometry version listed in the next section.
Function  Description 

STXY_CONTAINS(geom, x, y)  Returns 1 (true) if geom contains the x and y coordinate, e.g. lies in the interior of geom. The coordinate cannot be on the boundary and also be contained because geom does not contain its boundary 
STXY_CONTAINSPROPERLY(geom, x, y)  Returns 1 (true) if the x and y coordinate intersects the interior of geom but not the boundary (or exterior) because geom does not contain its boundary but does contain itself 
STXY_COVEREDBY(x, y, geom)  Returns 1 (true) if the x and y coordinate is covered by geom 
STXY_COVERS(geom, x, y)  Returns 1 (true) if geom covers the x and y coordinate 
STXY_DISJOINT(x, y, geom)  Returns 1 (true) if the given x and y coordinate and the geometry geom do not spatially intersect. 
STXY_DISTANCE(x, y, geom[, solution])  Calculates the minimum distance between the given x and y coordinate and geom using the specified solution type. Solution types available:
Note: If the x and y coordinate and geom intersect (verify using ST_INTERSECTS), the distance will always be 0. 
STXY_DWITHIN(x, y, geom, distance[, solution])  Returns 1 (true) if the x and y coordinate is within the specified distance from geom using the specified solution type. Solution types available:

STXY_ENVDWITHIN(x, y, geom, distance[, solution])  Returns 1 (true) if the x and y coordinate is within the specified distance from the bounding box of geom using the specified solution type. Solution types available:

STXY_ENVINTERSECTS(x, y, geom)  Returns 1 (true) if the bounding box of the given geometry geom intersects the x and y coordinate. 
STXY_INTERSECTION(x, y, geom)  Returns the shared portion between the x and y coordinate and the given geometry geom, i.e. the point itself. 
STXY_INTERSECTS(x, y, geom)  Returns 1 (true) if the x and y coordinate and geom intersect in 2D. 
STXY_TOUCHES(x, y, geom)  Returns 1 (true) if the x and y coordinate and geometry geom have at least one point in common but their interiors do not intersect. If geom is a GEOMETRYCOLLECTION, a 0 is returned regardless if the point and geometry touch 
STXY_WITHIN(x, y, geom)  Returns 1 (true) if the x and y coordinate is completely inside the geom geometry i.e., not on the boundary 
Scalar Functions
Function  Description 

DIST(x1, y1, x2, y2)  Computes the Euclidean distance (in degrees), i.e. SQRT( (x1x2)*(x1x2) + (y1y2)*(y1y2) ). 
GEODIST(lon1, lat1, lon2, lat2)  Computes the geographic greatcircle distance (in meters) between two lat/lon points. 
GEOHASH_DECODE_LATITUDE(geohash)  Decodes a given geohash and returns the latitude value for the given hash string. Supports a maximum geohash character length of 16. 
GEOHASH_DECODE_LONGITUDE(geohash)  Decodes a given geohash and returns the longitude value for the given hash string. Supports a maximum geohash character length of 16. 
GEOHASH_ENCODE(lat, lon, precision)  Encodes a given coordinate pair and returns a hash string with a given precision. 
ST_ADDPOINT(linestring, point, position)  Adds a given point geometry to the given linestring geometry at the specified position, which is a 0based index. 
ST_ALMOSTEQUALS(geom1, geom2, decimal)  Returns 1 (true) if given geometries, geom1 and geom2, are almost spatially equal within the given amount of decimal scale. Note that geometries will still be considered equal if the decimal scale for the geometries is within a half order of magnitude of each other, e.g, if decimal is set to 2, then POINT(63.4 123.45) and POINT(63.4 123.454) are equal, but POINT(63.4 123.45) and POINT(63.4 123.459) are not equal. The geometry types must match to be considered equal. 
ST_AREA(geom[, solution])  Returns the area of the given geometry geom if it is a POLYGON or MULTIPOLYGON using the specified solution type. Returns 0 if the input geometry type is (MULTI)POINT or (MULTI)LINESTRING. Solution types available:

ST_AZIMUTH(geom1, geom2)  Returns the azimuth in radians defined by the segment between two POINTs, geom1 and geom2. Returns a null if the input geometry type is MULTIPOINT, (MULTI)LINESTRING, or (MULTI)POLYGON. 
ST_BOUNDARY(geom)  Returns the closure of the combinatorial boundary of a given geometry geom. Returns an empty geometry if geom is an empty geometry. Returns a null if geom is a GEOMETRYCOLLECTION 
ST_BOUNDINGDIAGONAL(geom)  Returns the diagonal of the given geometry's (geom) bounding box. 
ST_BUFFER(geom, radius[, style[, solution]])  Returns a geometry that represents all points whose distance from the given geometry geom is less than or equal to the given distance radius. The radius units can be specified by the solution type (default is in degrees) and the radius is created in the provided style. The style options are specified as a list of blankseparated keyvalue pairs, e.g., 'quad_segs=8 endcap=round'. If an empty style list ('') is provided, the default settings will be used. The style parameter must be specified to provide a solution type. Available style options:
Available solution types:
Tip To create a 5meter buffer around geom using the default styles: ST_BUFFER(geom, 5, '', 1). To create a 5foot (converting feet to meters) buffer around geom using the following styles: ST_BUFFER(geom, 5*0.3048,'quad_segs=4 endcap=flat', 1) 
ST_CENTROID(geom)  Calculates the center of the given geometry geom as a POINT. For (MULTI)POINTs, the center is calculated as the average of the input coordinates. For (MULTI)LINESTRINGs, the center is calculated as the weighted length of each given LINESTRING. For (MULTI)POLYGONs, the center is calculated as the weighted area of each given POLYGON. If geom is an empty geometry, an empty GEOMETRYCOLLECTION is returned 
ST_CLIP(geom1, geom2)  Returns the geometry shared between given geometries geom1 and geom2 
ST_CLOSESTPOINT(geom1, geom2[, solution])  Calculates the 2D POINT in geom1 that is closest to geom2 using the specified solution type. If geom1 or geom2 is empty, a null is returned. Solution types available:

ST_COLLECT(geom1, geom2)  Returns a MULTI* or GEOMETRYCOLLECTION comprising geom1 and geom2. If geom1 and geom2 are the same, singular geometry type, a MULTI* is returned, e.g., if geom1 and geom2 are both POINTs (empty or no), a MULTIPOINT is returned. If geom1 and geom2 are neither the same type nor singular geometries, a GEOMETRYCOLLECTION is returned. 
ST_COLLECTIONEXTRACT(collection, type)  Returns only the specified type from the given geometry collection. Type is a number that maps to the following:

ST_COLLECTIONHOMOGENIZE(collection)  Returns the simplest form of the given collection, e.g., a collection with a single POINT will be returned as POINT(x y), and a collection with multiple individual points will be returned as a MULTIPOINT. 
ST_CONCAVEHULL(geom, target_percent[, allow_holes])  Returns a potentially concave geometry that encloses all geometries found in the given geom set. Use target_percent (values between 0 and 1) to determine the percent of area of a convex hull the concave hull will attempt to fill; 1 will return the same geometry as an ST_CONVEXHULL operation. Set allow_holes to 1 (true) to allow holes in the resulting geometry; default value is 0 (false). Note that allow_holes is independent of the area of target_percent. 
ST_CONTAINS(geom1, geom2)  Returns 1 (true) if no points of geom2 lie in the exterior of geom1 and at least one point of geom2 lies in the interior of geom1. Note that geom1 does not contain its boundary but does contain itself. 
ST_CONTAINSPROPERLY(geom1, geom2)  Returns 1 (true) if geom2 intersects the interior of geom1 but not the boundary (or exterior). Note that geom1 does not contain its boundary but does contain itself. 
ST_CONVEXHULL(geom)  Returns the minimum convex geometry that encloses all geometries in the given geom set. 
ST_COORDDIM(geom)  Returns the coordinate dimension of the given geom, e.g., a geometry with x, y, and z coordinates would return 3. 
ST_COVEREDBY(geom1, geom2)  Returns 1 (true) if no point in geom1 is outside geom2. 
ST_COVERS(geom1, geom2)  Returns 1 (true) if no point in geom2 is outside geom1. 
ST_CROSSES(geom1, geom2)  Returns 1 (true) if the given geometries, geom1 and geom2, spatially cross, meaning some but not all interior points in common. If geom1 and/or geom2 are a GEOMETRYCOLLECTION, a 0 is returned regardless if the two geometries cross 
ST_DIFFERENCE(geom1, geom2)  Returns a geometry that represents the part of geom1 that does not intersect with geom2. 
ST_DIMENSION(geom)  Returns the dimension of the given geometry geom, which is less than or equal to the coordinate dimension. If geom is a single geometry, a 0 is for POINT, a 1 is for LINESTRING, and a 2 is for POLYGON. If geom is a collection, it will return the largest dimension from the collection. If geom is empty, 0 is returned. 
ST_DISJOINT(geom1, geom2)  Returns 1 (true) if the given geometries, geom1 and geom2, do not spatially intersect. 
ST_DISTANCE(geom1, geom2[, solution])  Calculates the minimum distance between the given geometries, geom1 and geom2, using the specified solution type. Solution types available:
Note: If geom1 and geom2 intersect (verify using ST_INTERSECTS), the distance will always be 0. 
ST_DISTANCEPOINTS(x1, y1, x2, y2[, solution])  Calculates the minimum distance between the given points, x1, y1 and x2, y2, using the specified solution type. Solution types available:

ST_DFULLYWITHIN(geom1, geom2, distance[, solution])  Returns 1 (true) if the maximum distance between geometries geom1 and geom2 is less than or equal to the specified distance of each other using the specified solution type. If geom1 or geom2 is null, 0 (false) is returned. Solution types available:

ST_DWITHIN(geom1, geom2, distance[, solution])  Returns 1 (true) if the minimum distance between geometries geom1 and geom2 is within the specified distance of each other using the specified solution type. Solution types available:

ST_ELLIPSE(centerx, centery, height, width)  Returns an ellipse using the following values:

ST_ENDPOINT(geom)  Returns the last point of the given geom as a POINT if it's a LINESTRING. If geom is not a a LINESTRING, null is returned. 
ST_ENVDWITHIN(geom1, geom2, distance[, solution])  Returns 1 (true) if geom1 is within the specified distance of the bounding box of geom2 using the specified solution type. Solution types available:

ST_ENVELOPE(geom)  Returns the bounding box of a given geometry geom. 
ST_ENVINTERSECTS(geom1, geom2)  Returns 1 (true) if the bounding box of the given geometries, geom1 and geom2, intersect. 
ST_EQUALS(geom1, geom2)  Returns 1 (true) if the given geometries, geom1 and geom2, are spatially equal. Note that order does not matter. 
ST_EQUALSEXACT(geom1, geom2, tolerance)  Returns 1 (true) if the given geometries, geom1 and geom2, are almost spatially equal within some given tolerance. If the values within the given geometries are within the tolerance value of each other, they're considered equal, e.g., if tolerance is 2, POINT(1 1) and POINT(1 3) are considered equal, but POINT(1 1) and POINT(1 3.1) are not. Note that the geometry types have to match for them to be considered equal. 
ST_ERASE(geom1, geom2)  Returns the result of erasing a portion of geom1 equal to the size of geom2. 
ST_EXPAND(geom, units)  Returns the bounding box expanded in all directions by the given units of the given geom. The expansion can also be defined for separate directions by providing separate parameters for each direction, e.g., ST_EXPAND(geom, unitsx, unitsy, unitsz, unitsm). 
ST_EXPANDBYRATE(geom, rate)  Returns the bounding box expanded by a given rate (a ratio of width and height) for the given geometry geom. The rate must be between 0 and 1. 
ST_EXTERIORRING(geom)  Returns a LINESTRING representing the exterior ring of the given POLYGON geom 
ST_FORCE2D(geom)  Returns the 2dimensional version (e.g., X and Y coordinates) of geom, the provided geometry or set of geometries (e.g., via GEOMETRYCOLLECTION or WKT column name). 
ST_FORCE3D(geom[, z])  Returns the 3dimensional version (e.g., X, Y, and Z coordinates) of geom, a provided geometry or set of geometries (e.g., via GEOMETRYCOLLECTION or WKT column name), using z as the geometry's new zvalue. The provided zvalues can also be derived from a numeric column. If no z is provided, a 0 will be applied. Note If a WKT column is provided for geom and a numeric column is provided for z, the z values will be matched to the provided geometries by row in the source table. If a singular geometry is provided for geom and a column is provided for z, threedimensional versions of the provided geometry will be returned for each z value found in the provided z column. If columns are provided for both geom and z and nulls are present in either column, the row containing null values will be skipped in the results. 
ST_GENERATEPOINTS(geom, num)  Creates a MULTIPOINT containing a number num of randomly generated points within the boundary of geom. 
ST_GEOHASH(geom, precision)  Returns a hash string representation of the given geometry geom with specified precision (the length of the geohash string). The longer the precision, the more precise the hash is. By default, precision is set to 20; the max for precision is 32. Returns null if geom is an empty geometry. Note The value returned will not be a geohash of the exact geometry but a geohash of the centroid of the given geometry 
ST_GEOMETRYN(geom, index)  Returns the index geometry back from the given geom geometry. The index starts from 1 to the number of geometry in geom. 
ST_GEOMETRYTYPE(geom)  Returns the type of geometry from the given geom. 
ST_GEOMETRYTYPEID(geom)  Returns the type ID of from geom. Type and ID mappings:

ST_GEOMFROMGEOHASH(geohash, precision)  Returns a POLYGON boundary box using the given geohash with a precision set by the integer precision. If precision is specified, the function will use as many characters in the hash equal to precision to create the geometry. If no precision is specified, the full length of the geohash is used. 
ST_GEOMFROMTEXT(wkt)  Returns a geometry from the given WellKnown text representation wkt. Note that this function is only compatible with constants 
ST_HEXGRID(xmin, ymin, xmax, ymax, cell_side[, limit])  Creates a MULTIPOLYGON containing a grid of hexagons between given minimum and maximum points of a bounding box. The minimum point cannot be greater than or equal to the maximum point. The size (in meters) of the individual hexagons' sides is determined by cell_side. The cell_side cannot be greater than the width or height of the bounding box. The maximum number of cells that can be produced is determined by limit, a positive integer. Supported values for limit:
If the custom limit request specifies more cells (based on the bounding box and the cell_side) than the system limit, a null is returned. 
ST_INTERIORRINGN(geom, n)  Returns the nth interior LINESTRING ring of the POLYGON geom. If geom is not a POLYGON or the given n is out of range, a null is returned. The index begins at 1 
ST_INTERSECTION(geom1, geom2)  Returns the shared portion between given geometries geom1 and geom2 
ST_INTERSECTS(geom1, geom2)  Returns 1 (true) if the given geometries, geom1 and geom2, intersect in 2D 
ST_ISCLOSED(geom)  Returns 1 (true) if the given geometry's (geom) start and end points coincide 
ST_ISCOLLECTION(geom)  Returns 1 (true) if geom is a collection, e.g., GEOMETRYCOLLECTION, MULTIPOINT, MULTILINESTRING, etc. 
ST_ISEMPTY(geom)  Returns 1 (true) if geom is empty 
ST_ISRING(geom)  Returns 1 (true) if LINESTRING geom is both closed (per ST_ISCLOSED) and "simple" (per ST_ISSIMPLE). Returns 0 if geom is not a LINESTRING 
ST_ISSIMPLE(geom)  Returns 1 (true) if geom has no anomalous geometric points, e.g., selfintersection or selftangency 
ST_ISVALID(geom)  Returns 1 (true) if geom (typically a [MULTI]POLYGON) is well formed. A POLYGON is valid if its rings do not cross and its boundary intersects only at POINTs (not along a line). The POLYGON must also not have dangling LINESTRINGs. A MULTIPOLYGON is valid if all of its elements are also valid and the interior rings of those elements do not intersect. Each element's boundaries may touch but only at POINTs (not along a line) 
ST_LENGTH(geom[, solution])  Returns the length of the geometry if it is a LINESTRING or MULTILINESTRING. Returns 0 if another type of geometry, e.g., POINT, MULTIPOINT, etc. GEOMETRYCOLLECTIONs are also supported but the aforementioned type limitation still applies; the collection will be recursively searched for LINESTRINGs and MULTILINESTRINGs and the summation of all supported geometry types is returned (unsupported types are ignored). Solution types available:

ST_LINEFROMMULTIPOINT(geom)  Creates a LINESTRING from geom if it is a MULTIPOINT. Returns null if geom is not a MULTIPOINT 
ST_LINEINTERPOLATEPOINT(geom, fraction)  Returns a POINT that represents the specified fraction of the LINESTRING geom. If geom is either empty or not a LINESTRING, null is returned 
ST_LINELOCATEPOINT(linestring, point)  Returns the location of the closest point in the given linestring to the given point as a value between 0 and 1. The return value is a fraction of the total linestring length. 
ST_LINEMERGE(geom)  Returns a LINESTRING or MULTILINESTRING from a given geom. If geom is a MULTILINESTRING comprising LINESTRINGs with shared endpoints, a contiguous LINESTRING is returned. If geom is a LINESTRING or a MULTILINESTRING comprising LINESTRINGS without shared endpoints, geom is returned If geom is an empty (MULTI)LINESTRING or a (MULTI)POINT or (MULTI)POLYGON, an empty GEOMETRYCOLLECTION is returned. 
ST_LINESUBSTRING(geom, start_fraction, end_fraction)  Returns the fraction of a given geom LINESTRING where start_fraction and end_fraction are between 0 and 1. For example, given LINESTRING(1 1, 2 2, 3 3) a start_fraction of 0 and an end_fraction of 0.25 would yield the first quarter of the given LINESTRING, or LINESTRING(1 1, 1.5 1.5). Returns null if start_fraction is greater than end_fraction. Returns null if input geometry is (MULTI)POINT, MULTILINESTRING, or (MULTI)POLYGON. Returns null if start_fraction and/or end_fraction are less than 0 or more than 1. 
ST_LONGESTLINE(geom1, geom2[, solution])  Returns the LINESTRING that represents the longest line of points between the two geometries. If multiple longest lines are found, only the first line found is returned. If geom1 or geom2 is empty, null is returned. Solution types available:

ST_MAKEENVELOPE(xmin, ymin, xmax, ymax)  Creates a rectangular POLYGON from the given min and max parameters 
ST_MAKELINE(geom[, geom2])  Creates a LINESTRING from geom if it is a MULTIPOINT. If geom is a POINT, there must be at least one other POINT to construct a LINESTRING. If geom is a LINESTRING, it must have at least two points. Returns null if geom is not a POINT, MULTIPOINT, or LINESTRING Note This function can be rather costly in terms of performance 
ST_MAKEPOINT(x, y)  Creates a POINT at the given coordinate Note This function can be rather costly in terms of performance 
ST_MAKEPOLYGON(geom)  Creates a POLYGON from geom. Inputs must be closed LINESTRINGs Note This function can be rather costly in terms of performance 
ST_MAKETRIANGLE2D(x1, y1, x2, y2, x3, y3)  Creates a closed 2D POLYGON with three vertices 
ST_MAKETRIANGLE3D(x1, y1, z1, x2, y2, z2, x3, y3, z3)  Creates a closed 3D POLYGON with three vertices 
ST_MAXDISTANCE(geom1, geom2[, solution])  Returns the maximum distance between the given geom1 and geom2 geometries using the specifed solution type. If geom1 or geom2 is empty, null is returned. Solution types available:

ST_MAXX(geom)  Returns the maximum x coordinate of a bounding box for the given geom geometry. This function works for 2D and 3D geometries. 
ST_MAXY(geom)  Returns the maximum y coordinate of a bounding box for the given geom geometry. This function works for 2D and 3D geometries. 
ST_MAXZ(geom)  Returns the maximum z coordinate of a bounding box for the given geom geometry. This function works for 2D and 3D geometries. 
ST_MINX(geom)  Returns the minimum x coordinate of a bounding box for the given geom geometry. This function works for 2D and 3D geometries. 
ST_MINY(geom)  Returns the minimum y coordinate of a bounding box for the given geom geometry. This function works for 2D and 3D geometries. 
ST_MINZ(geom)  Returns the minimum z coordinate of a bounding box for the given geom geometry. This function works for 2D and 3D geometries. 
ST_MULTI(geom)  Returns geom as a MULTI geometry, e.g., a POINT would return a MULTIPOINT. 
ST_MULTIPLERINGBUFFERS(geom, distance, outside)  Creates multiple buffers at specified distance around the given geom geometry. Multiple distances are specified as commaseparated values in an array, e.g., [10,20,30]. Valid values for outside are:

ST_NEAR(geom1, geom2)  Returns the portion of geom2 that is closest to geom1. If geom2 is a singular geometry object (e.g., POINT, LINESTRING, POLYGON), geom2 will be returned. If geom2 a multigeometry, e.g., MULTIPOINT, MULTILINESTRING, etc., the nearest singular geometry in geom2 will be returned. 
ST_NORMALIZE(geom)  Returns geom in its normalized (canonical) form, which may rearrange the points in lexicographical order. 
ST_NPOINTS(geom)  Returns the number of points (vertices) in geom. 
ST_NUMGEOMETRIES(geom)  If geom is a collection or MULTI geometry, returns the number of geometries. If geom is a single geometry, returns 1. 
ST_NUMINTERIORRINGS(geom)  Returns the number of interior rings if geom is a POLYGON. Returns null if geom is anything else. 
ST_NUMPOINTS(geom)  Returns the number of points in the geom LINESTRING. Returns null if geom is not a LINESTRING. 
ST_OVERLAPS(geom1, geom2)  Returns 1 (true) if given geometries geom1 and geom2 share space. If geom1 and/or geom2 are a GEOMETRYCOLLECTION, a 0 is returned regardless if the two geometries overlap 
ST_PARTITION(geom, threshold)  Returns a MULTIPOLYGON representing the given geom partitioned into a number of POLYGONs with a maximum number of vertices equal to the given threshold. Minimum value for threshold is 10; default value is 10000. If geom is not a POLYGON or MULTIPOLYGON, geom is returned. If the number of vertices in geom is less than the threshold, geom is returned. 
ST_PERIMETER(geom[, solution])  Returns the perimeter of the geometry if it is a POLYGON or MULTIPOLYGON. Returns 0 if another type of geometry, e.g., POINT, MULTIPOINT, LINESTRING, or MULTILINESTRING. GEOMETRYCOLLECTIONs are also supported but the aforementioned type limitation still applies; the collection will be recursively searched for POLYGONs and MULTIPOLYGONs and the summation of all supported geometry types is returned (unsupported types are ignored). Solution types available:

ST_POINT(x, y)  Returns a POINT with the given x and y coordinates. 
ST_POINTFROMGEOHASH(geohash, precision)  Returns a POINT using the given geohash with a precision set by the integer precision. If precision is specified, the function will use as many characters in the hash equal to precision to create the geometry. If no precision is specified, the full length of the geohash is used. Note The POINT returned represents the center of the bounding box of the geohash 
ST_POINTGRID(xmin, ymin, xmax, ymax, cell_side[, limit])  Creates a MULTIPOLYGON containing a squareshaped grid of points between given minimum and maximum points of a bounding box. The minimum point cannot be greater than or equal to the maximum point. The distance between the points (in meters) is determined by cell_side. The cell_side cannot be greater than the width or height of the bounding box. The maximum number of cells that can be produced is determined by limit, a positive integer. Supported values for limit:
If the custom limit request specifies more cells (based on the bounding box and the cell_side) than the system limit, a null is returned. 
ST_POINTN(geom, n)  Returns the nth point in LINESTRING geom. Negative values are valid, but note that they are counted backwards from the end of geom. A null is returned if geom is not a LINESTRING. 
ST_POINTS(geom)  Returns a MULTIPOINT containing all of the coordinates of geom. 
ST_PROJECT(geom, distance, azimuth)  Returns a POINT projected from a start point geom along a geodesic calculated using distance and azimuth. If geom is not a POINT, null is returned. 
ST_REMOVEPOINT(geom, offset)  Remove a point from LINESTRING geom using offset to skip over POINTs in the LINESTRING. The offset is 0based. 
ST_REMOVEREPEATEDPOINTS(geom, tolerance)  Removes points from geom if the point's vertices are greater than or equal to the tolerance of the previous point in the geometry's list. If geom is not a MULTIPOINT, MULTILINESTRING, or a MULTIPOLYGON, no points will be removed. 
ST_REVERSE(geom)  Return the geometry with its coordinate order reversed. 
ST_SCALE(geom, x, y)  Scales geom by multiplying its respective vertices by the given x and y values. This function also supports scaling geom using another geometry object, e.g., ST_SCALE('POINT(3 4)', 'POINT(5 6)') would return POINT(15 24). If specifying x and y for scale, note that the default value is 0, e.g., ST_SCALE('POINT(1 3)', 4) would return POINT(4 0). 
ST_SEGMENTIZE(geom, max_segment_length[, solution])  Returns the given geom but segmentized n number of times depending on how the max_segment_length distance (in units based on the solution type) divides up the original geometry. The new geom is guaranteed to have segments that are smaller than the given max_segment_length. Note that POINTs are not able to be segmentized. Collection geometries (GEOMETRYCOLLECTION, MULTILINESTRING, MULTIPOINT, etc.) can be segmentized, but only the individual parts will be segmentized, not the collection as a whole. Solution types available:

ST_SETPOINT(geom1, position, geom2)  Replace a point of LINESTRING geom1 with POINT geom2 at position (base 0). Negative values are valid, but note that they are counted backwards from the end of geom. 
ST_SHAREDPATH(geom1, geom2)  Returns a collection containing paths shared by geom1 and geom2. 
ST_SHORTESTLINE(geom1, geom2)  Returns the 2D LINESTRING that represents the shortest line of points between the two geometries. If multiple shortest lines are found, only the first line found is returned. If geom1 or geom2 is empty, null is returned 
ST_SIMPLIFY(geom, tolerance)  Returns a simplified version of the given geom using an algorithm to reduce the number of points comprising a given geometry while attempting to best retain the original shape. The given tolerance determines how much to simplify the geometry. The higher the tolerance, the more simplified the returned geometry. Some holes might be removed and some invalid polygons (e.g., selfintersecting, etc.) might be present in the returned geometry. Only (MULTI)LINESTRINGs and (MULTI)POLYGONs can be simplified, including those found within GEOMETRYCOLLECTIONs; any other geometry objects will be returned unsimplified. Note The tolerance should be provided in the same units as the data. As a rule of thumb, a tolerance of 0.00001 would correspond to about one meter. 
ST_SIMPLIFYPRESERVETOPOLOGY(geom, tolerance)  Returns a simplified version of the given geom using an algorithm to reduce the number of points comprising a given geometry while attempting to best retain the original shape. The given tolerance determines how much to simplify the geometry. The higher the tolerance, the more simplified the returned geometry. No holes will be removed and no invalid polygons (e.g., selfintersecting, etc.) will be present in the returned geometry. Only (MULTI)LINESTRINGs and (MULTI)POLYGONs can be simplified, including those found within GEOMETRYCOLLECTIONs; any other geometry objects will be returned unsimplified. Note The tolerance should be provided in the same units as the data. As a rule of thumb, a tolerance of 0.00001 would correspond to about one meter. 
ST_SNAP(geom1, geom2, tolerance)  Snaps geom1 to geom2 within the given tolerance. If the tolerance causes geom1 to not snap, the geometries will be returned unchanged. 
ST_SPLIT(geom1, geom2)  Returns a collection of geometries resulting from the split between geom1 and geom2 geometries. 
ST_SQUAREGRID(xmin, ymin, xmax, ymax, cell_side[, limit])  Creates a MULTIPOLYGON containing a grid of squares between given minimum and maximum points of a bounding box. The minimum point cannot be greater than or equal to the maximum point. The size (in meters) of the individual squares' sides is determined by cell_side. The cell_side cannot be greater than the width or height of the bounding box. The maximum number of cells that can be produced is determined by limit, a positive integer. Supported values for limit:
If the custom limit request specifies more cells (based on the bounding box and the cell_side) than the system limit, a null is returned. 
ST_STARTPOINT(geom)  Returns the first point of LINESTRING geom as a POINT. Returns null if geom is not a LINESTRING. 
ST_SYMDIFFERENCE(geom1, geom2)  Returns a geometry that represents the portions of geom1 and geom2 geometries that do not intersect. 
ST_TOUCHES(geom1, geom2)  Returns 1 (true) if the given geometries, geom1 and geom2, have at least one point in common but their interiors do not intersect. If geom1 and/or geom2 are a GEOMETRYCOLLECTION, a 0 is returned regardless if the two geometries touch 
ST_TRANSLATE(geom, deltax, deltay[, deltaz])  Translate geom by given offsets deltax and deltay. A zcoordinate offset can be applied using deltaz. 
ST_TRIANGLEGRID(xmin, ymin, xmax, ymax, cell_side[, limit])  Creates a MULTIPOLYGON containing a grid of triangles between given minimum and maximum points of a bounding box. The minimum point cannot be greater than or equal to the maximum point. The size (in meters) of the individual triangles' sides is determined by cell_side. The cell_side cannot be greater than the width or height of the bounding box. The maximum number of cells that can be produced is determined by limit, a positive integer. Supported values for limit:
If the custom limit request specifies more cells (based on the bounding box and the cell_side) than the system limit, a null is returned. 
ST_UNION(geom1, geom2)  Returns a geometry that represents the point set union of the two given geometries, geom1 and geom2. 
ST_UNIONCOLLECTION(geom)  Returns a geometry that represents the point set union of a single given geometry geom. 
ST_UPDATE(geom1, geom2)  Returns a geometry that is geom1 geometry updated by geom2 geometry 
ST_VORONOIPOLYGONS(geom, tolerance)  Returns a GEOMETRYCOLLECTION containing Voronoi polygons (regions consisting of points closer to a vertex in geom than any other vertices in geom) calculated from the vertices in geom and the given tolerance. The tolerance determines the distance at which points will be considered the same. An empty GEOMETRYCOLLECTION is returned if geom is an empty geometry, a single POINT, or a LINESTRING or POLYGON composed of equivalent vertices (e.g., POLYGON((0 0, 0 0, 0 0, 0 0)), LINESTRING(0 0, 0 0)). 
ST_WITHIN(geom1, geom2)  Returns 1 (true) if the geom1 geometry is inside the geom2 geometry. Note that as long as at least one point is inside of geom2, geom1 is considered within geom2 even if the rest of the geom1 lies along the boundary of geom2 
ST_WKTTOWKB(geom)  Returns the binary form (WKB) of a geom (WKT) Note This function can only be used in queries against a single table. 
ST_X(geom)  Returns the X coordinate of the POINT geom; if the coordinate is not available, null is returned. geom must be a POINT. 
ST_XMAX(geom)  Alias for ST_MAXX() 
ST_XMIN(geom)  Alias for ST_MINX() 
ST_Y(geom)  Returns the Y coordinate of the POINT geom; if the coordinate is not available, null is returned. geom must be a POINT. 
ST_YMAX(geom)  Alias for ST_MAXY() 
ST_YMIN(geom)  Alias for ST_MINY() 
ST_ZMAX(geom)  Alias for ST_MAXZ() 
ST_ZMIN(geom)  Alias for ST_MINZ() 
Aggregation Functions
Function  Description 

ST_AGGREGATE_COLLECT(geom)  Alias for ST_COLLECT_AGGREGATE() 
ST_AGGREGATE_INTERSECTION(geom)  Alias for ST_INTERSECTION_AGGREGATE() 
ST_COLLECT_AGGREGATE(geom)  Returns a GEOMETRYCOLLECTION comprising all geometries found in the geom set. Any MULTI* geometries will be divided into separate singular geometries, e.g., MULTIPOINT((0 0), (1 1)) would be divided into POINT(0 0) and POINT(1 1) in the results; the same is true for elements of a GEOMETRYCOLLECTION found in geom, where a GEOMETRYCOLLECTION within the provided geom set will also be parsed, effectively flattening it and adding the individual geometries to the resulting GEOMETRYCOLLECTION. Any empty geometries in geom are ignored even if they are part of a GEOMETRYCOLLECTION. Any duplicate WKTs will be retained. 
ST_DISSOLVE(geom)  Dissolves all geometries within a given set into a single geometry. Note that the resulting single geometry can still be a group of noncontiguous geometries but represented as a single group, e.g., a GEOMETRYCOLLECTION. Best performance when used in conjunction with adjacent geometries 
ST_DISSOLVEOVERLAPPING(geom)  Dissolves all geometries within a given set into a single geometry. Note that the resulting single geometry can still be a group of noncontiguous geometries but represented as a single group, e.g., a GEOMETRYCOLLECTION. Best performance when used in conjunction with overlapping geometries 
ST_INTERSECTION_AGGREGATE(geom)  Returns a POLYGON or MULTIPOLYGON comprising the shared portion between all geometries found in the geom set. Returns an empty GEOMETRYCOLLECTION if there is no shared portion between all geometries. Functionally equivalent to ST_INTERSECTION(ST_INTERSECTION(ST_INTERSECTION(geom1, geom2), geom3), ... geomN). 
ST_LINESTRINGFROMORDEREDPOINTS(x, y, t)  Returns a LINESTRING that represents a "track" of the given points (x, y) ordered by the given sort column t (e.g., a timestamp or sequence number). If any of the values in the specified columns are null, the null "point" will be left out of the resulting LINESTRING. If there's only one nonnull "point" in the source table, a POINT is returned. If there are no nonnull "points" in the source table, a null is returned 
ST_LINESTRINGFROMORDEREDPOINTS3D(x, y, z, t)  Returns a LINESTRING that represents a "track" of the given 3D points (x, y, z) ordered by the given sort column t (e.g., a timestamp or sequence number). If any of the values in the specified columns are null, the null "point" will be left out of the resulting LINESTRING. If there's only one nonnull "point" in the source table, a POINT is returned. If there are no nonnull "points" in the source table, a null is returned 
ST_POLYGONIZE(geom)  Returns a GEOMETRYCOLLECTION containing POLYGONs comprising the provided (MULTI)LINESTRING(s). (MULTI)POINT and (MULTI)POLYGON geometries are ignored when calculating the resulting GEOMETRYCOLLECTION. If a valid POLYGON cannot be constructed from the provided (MULTI)LINESTRING(s), an empty GEOMETRYCOLLECTION will be returned. 
Math Functions
Function  Description  

ABS(expr)  Calculates the absolute value of expr  
ACOS(expr)  Returns the inverse cosine (arccosine) of expr as a double  
ACOSF(expr)  Returns the inverse cosine (arccosine) of expr as a float  
ACOSH(expr)  Returns the inverse hyperbolic cosine of expr as a double  
ACOSHF(expr)  Returns the inverse hyperbolic cosine of expr as a float  
ASIN(expr)  Returns the inverse sine (arcsine) of expr as a double  
ASINF(expr)  Returns the inverse sine (arcsine) of expr as a float  
ASINH(expr)  Returns the inverse hyperbolic sine of expr as a double  
ASINHF(expr)  Returns the inverse hyperbolic sine of expr as a float  
ATAN(expr)  Returns the inverse tangent (arctangent) of expr as a double  
ATANF(expr)  Returns the inverse tangent (arctangent) of expr as a float  
ATANH(expr)  Returns the inverse hyperbolic tangent of expr as a double  
ATANHF(expr)  Returns the inverse hyperbolic tangent of expr as a float  
ATAN2(x, y)  Returns the inverse tangent (arctangent) using two arguments as a double  
ATAN2F(x, y)  Returns the inverse tangent (arctangent) using two arguments as a float  
ATN2(x, y)  Alias for ATAN2  
ATN2F(x, y)  Alias for ATAN2F  
CBRT(expr)  Returns the cube root of expr as a double  
CBRTF(expr)  Returns the cube root of expr as a float  
CEIL(expr)  Alias for CEILING  
CEILING(expr)  Rounds expr up to the next highest integer  
COS(expr)  Returns the cosine of expr as a double  
COSF(expr)  Returns the cosine of expr as a float  
COSH(expr)  Returns the hyperbolic cosine of expr as a double  
COSHF(expr)  Returns the hyperbolic cosine of expr as a float  
COT(expr)  Returns the cotangent of expr as a double  
COTF(expr)  Returns the cotangent of expr as a float  
DEGREES(expr)  Returns the conversion of expr (in radians) to degrees as a double  
DEGREESF(expr)  Returns the conversion of expr (in radians) to degrees as a float  
DIVZ(a, b, c)  Returns the quotient a / b unless b == 0, in which case it returns c  
EXP(expr)  Returns e to the power of expr as a double  
EXPF(expr)  Returns e to the power of expr as a float  
FLOOR(expr)  Rounds expr down to the next lowest integer  
GREATER(expr_a, expr_b)  Returns whichever of expr_a and expr_b has the larger value, based on typed comparison  
HYPOT(x, y)  Returns the hypotenuse of x and y as a double  
HYPOTF(x, y)  Returns the hypotenuse of x and y as a float  
ISNAN(expr)  Returns 1 (true) if expr is not a number by IEEE standard; otherwise, returns 0 (false)  
IS_NAN(expr)  Alias for ISNAN  
ISINFINITY(expr)  Returns 1 (true) if expr is infinity by IEEE standard; otherwise, returns 0 (false)  
IS_INFINITY(expr)  Alias for ISINFINITY  
LDEXP(x, exp)  Returns the value of x * 2^{exp} as a double  
LDEXPF(x, exp)  Returns the value of x * 2^{exp} as a float  
LESSER(expr_a, expr_b)  Returns whichever of expr_a and expr_b has the smaller value, based on typed comparison  
LN(expr)  Returns the natural logarithm of expr as a double  
LNF(expr)  Returns the natural logarithm of expr as a float  
LOG(expr)  Alias for LN  
LOG10(expr)  Returns the base10 logarithm of expr as a double  
LOG10F(expr)  Returns the base10 logarithm of expr as a float  
LOG1P(expr)  Returns the natural logarithm of one plus expr as a double  
LOG1PF(expr)  Returns the natural logarithm of one plus expr as a float  
LOG2(expr)  Returns the binary (base2) logarithm of expr as a double  
LOG2F(expr)  Returns the binary (base2) logarithm of expr as a float  
LOGF(expr)  Alias for LNF  
MAX_CONSECUTIVE_BITS(expr)  Calculates the length of the longest series of consecutive 1 bits in the integer expr  
MOD(dividend, divisor)  Calculates the remainder after integer division of dividend by divisor  
PI()  Returns the value of pi  
POW(base, exponent)  Alias for POWER  
POWF(base, exponent)  Alias for POWERF  
POWER(base, exponent)  Returns base raised to the power of exponent as a double  
POWERF(base, exponent)  Returns base raised to the power of exponent as a float  
RADIANS(expr)  Returns the conversion of expr (in degrees) to radians as a double  
RADIANSF(expr)  Returns the conversion of expr (in degrees) to radians as a float  
RAND()  Returns a random floatingpoint value.  
ROUND(expr, scale)  Rounds expr to the nearest decimal number with scale decimal places when scale is a positive number; rounds to the nearest number such that the result has (scale) zeros to the left of the decimal point when scale is negative; use scale of 0 to round to the nearest integer. Examples:
 
SIGN(expr)  Determines whether a number is positive, negative, or zero; returns one of the following three values:
 
SIN(expr)  Returns the sine of expr as a double  
SINF(expr)  Returns the sine of expr as a float  
SINH(expr)  Returns the hyperbolic sine of expr as a double  
SINHF(expr)  Returns the hyperbolic sine of expr as a float  
SQRT(expr)  Returns the square root of expr as a double  
SQRTF(expr)  Returns the square root of expr as a float  
TAN(expr)  Returns the tangent of expr as a double  
TANF(expr)  Returns the tangent of expr as a float  
TANH(expr)  Returns the hyperbolic tangent of expr as a double  
TANHF(expr)  Returns the hyperbolic tangent of expr as a float  
TRUNCATE(expr, scale)  Rounds expr down to the nearest decimal number with scale decimal places, following the same rules as ROUND. Examples:

Null Functions
Important
Be mindful that no error is thrown when Kinetica tries to convert different data type in the Null functions below, so if the output is unexpected, it may be that the types used aren't of the same type.
Function  Description 

IS_NULL(expr)  Returns 1 (true) if expr is null; otherwise, returns 0 (false) 
NULLIF(expr_a, expr_b)  Returns null if expr_a equals expr_b; otherwise, returns the value of expr_a. Both expressions should be of the same convertible data type 
NVL(expr_a, expr_b)  Returns expr_a if it is not null; otherwise, returns expr_b. Both expressions should be of the same convertible data type; see ShortCircuiting for errorchecking details 
NVL2(expr, value_if_not_null, value_if_null)  Evaluates expr: if expr does not return a null, value_if_not_null is returned. If expr does return a null, value_if_null is returned. Both value_if_not_null and value_if_null should be of the same data type as expr or implicitly convertible; see ShortCircuiting for errorchecking details 
REMOVE_NULLABLE(expr)  Alias for ZEROIFNULL 
ZEROIFNULL(expr)  Replaces null values with appropriate values based on the column type (e.g., 0 if numeric column, an empty string if charN column, etc.). Also removes the nullable column property if used to calculate a derived column. 
String Functions
Important
These functions will only work with fixedwidth string fields (char1  char256).
Function  Description  

ASCII(expr)  Returns the ASCII code for the first character in expr  
CHAR(expr)  The character represented by the standard ASCII code expr in the range [ 0  127 ]  
CONCAT(expr_a, expr_b)  Performs a string concatenation of expr_a & expr_b; use nested CONCAT calls to concatenate more than two strings Note The resulting field size of any CONCAT will be a charN field big enough to hold the concatenated fields, e.g., concatenating a char32 column and a char64 column will result in a char128 column. Columns of type char256 cannot be used with CONCAT.  
CONCAT_TRUNCATE(expr_a, expr_b)  Returns the concatenation of expr_a and expr_b, truncated at the maximum size of expr_a. For columns, this size is explicit; for string constants, this will be the smallest charN type that can hold the expr_a string. Examples:
 
CONTAINS(match_expr, ref_expr)  Returns 1 if ref_expr contains match_expr by stringliteral comparison; otherwise, returns 0  
DIFFERENCE(expr_a, expr_b)  Returns a value between 0 and 4 that represents the difference between the sounds of expr_a and expr_b based on the SOUNDEX() value of the stringsa value of 4 is the best possible sound match  
EDIT_DISTANCE(expr_a, expr_b)  Returns the Levenshtein edit distance between expr_a and expr_b; the lower the the value, the more similar the two strings are  
ENDS_WITH(match_expr, ref_expr)  Returns 1 if ref_expr ends with match_expr by stringliteral comparison; otherwise, returns 0  
INITCAP(expr)  Returns expr with the first letter of each word in uppercase  
IPV4_PART(expr, part_num)  Returns the octet of the IP address given in expr at the position specified by part_num. Valid part_num values are constants from 1 to 4. Examples:
 
IS_IPV4(expr)  Returns 1 if expr is an IPV4 address; returns 0 otherwise  
LCASE(expr)  Converts expr to lowercase  
LEFT(expr, num_chars)  Returns the leftmost num_chars characters from expr  
LENGTH(expr)  Returns the number of characters in expr  
LIKE(ref_expr, match_expr)  Returns whether ref_expr matches the given match_expr. The match is a string literal one with the following exceptions:
 
LOCATE(match_expr, ref_expr[, start_pos])  Returns the starting position of the first match of match_expr in ref_expr, starting from position 1 or start_pos (if specified)  
LOWER(expr)  Alias for LCASE  
LPAD(base_expr, length, pad_expr)  Left pads the given base_expr string with the pad_expr string to the given length of characters. If base_expr is longer than length, the return value is shortened to length characters. If length is larger than 256, it will be truncated to 256. Examples:
 
LTRIM(expr)  Removes whitespace from the left side of expr  
POSITION(match_expr, ref_expr[, start_pos])  Alias for LOCATE  
REPLACE(ref_expr, match_expr, repl_expr)  Replaces every occurrence of match_expr in ref_expr with repl_expr  
REVERSE(expr)  Returns expr with the order of characters reversed. Examples:
 
RIGHT(expr, num_chars)  Returns the rightmost num_chars characters from expr  
RPAD(base_expr, length, pad_expr)  Right pads the given base_expr string with the pad_expr string to the given length of characters. If base_expr is longer than length, the return value is shortened to length characters. If length is larger than 256, it will be truncated to 256. Examples:
 
RTRIM(expr)  Removes whitespace from the right side of expr  
SOUNDEX(expr)  Returns a soundex value from expr. Only the first word in the string will be considered in the calculation. Note: This is the algorithm used by most programming languages  
SPACE(n)  Returns a string consisting of n space characters. The value of n can only be within the range of 0256.  
SPLIT(expr, delim, group_num)  Splits expr into groups delimited by the delim character and returns the group_num split group. If group_num is positive, groups will be counted from the beginning of expr; if negative, groups will be counted from the end of expr going backwards. Two consecutive delimiters will result in an empty string being added to the list of selectable groups. If no instances of delim exist in expr, the entire string is available at group 1 (and 1). Group 0 returns nothing. Examples:
 
STARTS_WITH(match_expr, ref_expr)  Returns 1 if ref_expr starts with match_expr by stringliteral comparison; otherwise, returns 0  
STRCMP(expr_a, expr_b)  Compares expr_a to expr_b in a lexicographical sort
 
SUBSTR(expr, start_pos, num_chars)  Alias for SUBSTRING  
SUBSTRING(expr, start_pos, num_chars)  Returns num_chars characters from the expr, starting at the 1based start_pos  
TRIM(expr)  Removes whitespace from both sides of expr  
UCASE(expr)  Converts expr to uppercase  
UPPER(expr)  Alias for UCASE 
User/Security Functions
Function  Description  

CURRENT_USER()  Alias for USER  
HASH(column[, seed])  Returns a nonnegative integer representing an obfuscated version of column, using the given seed; default seed is 0  
IS_MEMBER(role[, user]) or IS_ROLEMEMBER(role[, user])  Returns whether the current user (or the given user, if specified) has been assigned the given role, either directly or indirectly:
 
MASK(expr, start, length[, char])  Masks length characters of expr, beginning at the position identified by start, with * characters (or the character specified in char):
 
OBFUSCATE(column[, seed])  Alias for HASH  
SHA256(expr)  Returns the hex digits of the SHA256 hash of the given value expr as a char64 string.  
SYSTEM_USER()  Alias for USER  
USER()  Returns the username of the current user 
Column Expressions
Many of the functions above accept expressions as inputs in place of column names for selecting data from tables e.g. /aggregate/minmax. Given below are some examples of column expressions:
(x + y) (2 * col1) + col2
Filter Expressions
Data can be filtered with the use of filter expressions within many endpoints; e.g., /filter. These expressions may contain column expressions as well as tests for equality/inequality for selecting records from the database. A filter expression cannot contain aggregation functions and should evaluate to a logical value ( true or false ). When the result of an expression evaluation is a numerical value, the result is converted to a logical value as follows: 0 is considered false and any other value is considered as true. Some examples of filter expressions are given below:
(x > y) (a != b) or (c = d) (timestamp > 1456749296789) and (x <= 10.0) ABS(timestamp  1456749296789) < 60 * 60 * 1000 QUARTER(timestamp) = 1 and MOD(YEAR(timestamp), 4) = 0 msg_id == 'MSGID1' (x = 5) and y in (10,20,30)
Aggregate Expressions
Some endpoints accept aggregation expressions as inputs for selecting data from tables, e.g., /aggregate/groupby. Such expressions can only contain aggregation functions and nonnested functions of aggregation functions.
Function  Description 

ARG_MIN(agg_expr, ret_expr)  The value of ret_expr where agg_expr is the minimum value (e.g. ARG_MIN(cost, product_id) returns the product ID of the lowest cost product) 
ARG_MAX(agg_expr, ret_expr)  The value of ret_expr where agg_expr is the maximum value (e.g. ARG_MAX(cost, product_id) returns the product ID of the highest cost product) 
AVG(expr)  The average of values of expr 
CORR(expr1, expr2)  Calculates the correlation coefficient of expr1 and expr2 
CORRELATION(expr1, expr2)  Alias for CORR 
CORRCOEF(expr1, expr2)  Alias for CORR 
COUNT(expr)  Count of nonnull values of expr; use * to count all values within an aggregation group or over an entire table 
COUNT_DISTINCT(expr)  Count of the distinct values of expr 
COV(expr1, expr2)  Alias for COVAR_POP 
COVAR(expr1, expr2)  Alias for COVAR_POP 
COVARIANCE(expr1, expr2)  Alias for COVAR_POP 
COVAR_POP(expr1, expr2)  Calculates the population covariance of expr1 and expr2 
COVAR_SAMP(expr1, expr2)  Calculates the sample covariance of expr1 and expr2 
GROUPING(expr)  Used primarily with Rollup, Cube, and Grouping Sets, to distinguish the source of null values in an aggregated result set, returns whether expr is part of the aggregation set used to calculate the values in a given result set row. Returns 0 if expr is part of the row's aggregation set, 1 if expr is not (meaning that aggregation took place across all expr values). For example, in a ROLLUP(A) operation, there will be two potential rows with null in the result set for column A. One row will contain null values of A aggregated together, and the other will contain null, but be an aggregation over the entire table, irrespective of A values. In this case, GROUPING(A) will return 0 for the null values of A aggregated together (as well as all other grouped A values) and 1 for the row resulting from aggregating across all A values. 
KURT(expr)  Alias for KURTOSIS_POP 
KURTOSIS(expr)  Alias for KURTOSIS_POP 
KURTOSIS_POP(expr)  Calculate the population kurtosis of expr 
KURTOSIS_SAMP(expr)  Calculate the sample kurtosis of expr 
KURT_POP(expr)  Alias for KURTOSIS_POP 
KURT_SAMP(expr)  Alias for KURTOSIS_SAMP 
MAX(expr)  The maximum of values of expr 
MEAN(expr)  Alias for AVG 
MIN(expr)  The minimum of values of expr 
PRODUCT(expr)  The product of values of expr 
SKEW(expr)  Alias for SKEWNESS_POP 
SKEWNESS(expr)  Alias for SKEWNESS_POP 
SKEWNESS_POP(expr)  Calculate the population skew of expr 
SKEWNESS_SAMP(expr)  Calculate the sample skew of expr 
SKEW_POP(expr)  Alias for SKEWNESS_POP 
SKEW_SAMP(expr)  Alias for SKEWNESS_SAMP 
STDDEV(expr)  The population standard deviation over values of expr (i.e. the denominator is N) 
STDDEV_POP(expr)  The population standard deviation over values of expr (i.e. the denominator is N) 
STDDEV_SAMP(expr)  The sample standard deviation over values of expr (i.e. the denominator is N1) 
SUM(expr)  The sum of values of expr 
VAR(expr)  The population variance over values of expr (i.e. the denominator is N) 
VAR_POP(expr)  The population variance over values of expr (i.e. the denominator is N) 
VAR_SAMP(expr)  The sample variance over values of expr (i.e. the denominator is N1) 
Some examples of aggregate expressions:
SUM(sale_price)  SUM(base_price) MAX(CEIL(x))  MIN(FLOOR(x)) AVG(ABS(z  100.0))
ShortCircuiting
The logical operators and & or implement a version of boolean shortcircuiting where if either side of the expression encounters an error (dividebyzero, etc.) but the other side evaluates to a value that alone would determine the overall value of the logical expression, the error will be ignored and the logical value returned:
 If one side of an and evaluates to false and the other side evaluates to an error, false will be returned.
 If one side of an or evaluates to true and the other side evaluates to an error, true will be returned.
In the normal case, both sides of either of these operators would be evaluated simultaneously. However, to allow these operators to be used to check for error conditions, if an error is encountered on either side but the other side is enough information to determine the overall value of the expression, the error will be ignored.
This same behavior applies to the evaluation branches of the following functions:
 IF
 NVL
 NVL2
It also applies to SQL conditional functions.