> ## Documentation Index > Fetch the complete documentation index at: https://docs.kinetica.com/llms.txt > Use this file to discover all available pages before exploring further. # column_property > column_property — Kinetica Rust API [gpudb\_api](https://docs.kinetica.com/content/api/rust/index.md) [Source](https://github.com/kineticadb/kinetica-api-rust/blob/master/crates/gpudb-api/src/column_property.rs#L1-L100) The column properties a Kinetica type can give its columns, as text. A [`Column`](https://docs.kinetica.com/content/api/rust/generic_record/struct.Column) takes them in its properties, and [`KineticaColumnProperties`](https://docs.kinetica.com/content/api/rust/avro_schema_builder/struct.KineticaColumnProperties) builds them. ## Constants `pub const ARRAY: &str = "array";` A string column holding an array, `array([,])`. `pub const BOOLEAN: &str = "boolean";` An int column holding a boolean, 0 or 1. `pub const CHAR1: &str = "char1";` A string column of at most 1 character. `pub const CHAR2: &str = "char2";` A string column of at most 2 characters. `pub const CHAR4: &str = "char4";` A string column of at most 4 characters. `pub const CHAR8: &str = "char8";` A string column of at most 8 characters. `pub const CHAR16: &str = "char16";` A string column of at most 16 characters. `pub const CHAR32: &str = "char32";` A string column of at most 32 characters. `pub const CHAR64: &str = "char64";` A string column of at most 64 characters. `pub const CHAR128: &str = "char128";` A string column of at most 128 characters. `pub const CHAR256: &str = "char256";` A string column of at most 256 characters. `pub const COMPRESS: &str = "compress";` The column’s data is compressed. `pub const DATA: &str = "data";` Data is stored for this column; the default. `pub const DATE: &str = "date";` A string column holding a date, `YYYY-MM-DD`. `pub const DATETIME: &str = "datetime";` A string column holding a date and time, `YYYY-MM-DD HH:MM:SS[.mmm]`. `pub const DECIMAL: &str = "decimal";` A string column holding a decimal, `decimal(P,S)` for its precision and scale. `pub const DEFAULT: &str = "default";` The column’s default, `default()`. `pub const DEFAULT_SQL: &str = "default_sql";` The column’s default as an SQL expression. `pub const DICT: &str = "dict";` The column’s values are dictionary-encoded. `pub const INIT_WITH_NOW: &str = "init_with_now";` The column takes the time of insertion where no value is given. `pub const INIT_WITH_UUID: &str = "init_with_uuid";` The column takes a new UUID where no value is given. `pub const INT8: &str = "int8";` An int column holding an 8-bit integer. `pub const INT16: &str = "int16";` An int column holding a 16-bit integer. `pub const IPV4: &str = "ipv4";` A string column holding an IPv4 address. `pub const JSON: &str = "json";` A string column holding JSON. `pub const NULLABLE: &str = "nullable";` The column may hold nulls. `pub const PRIMARY_KEY: &str = "primary_key";` The column is part of the primary key. `pub const SHARD_KEY: &str = "shard_key";` The column is part of the shard key. `pub const SOFT_PRIMARY_KEY: &str = "soft_primary_key";` The column is part of a primary key that is not enforced. `pub const TEXT_SEARCH: &str = "text_search";` Full-text search is enabled on this column. `pub const TIME: &str = "time";` A string column holding a time, `HH:MM:SS[.mmm]`. `pub const TIMESTAMP: &str = "timestamp";` A long column holding milliseconds since the epoch. `pub const ULONG: &str = "ulong";` A string column holding an unsigned long. `pub const UPDATE_WITH_NOW: &str = "update_with_now";` The column takes the time of each update. `pub const UPDATE_WITH_USER: &str = "update_with_user";` The column takes the user making each update. `pub const UUID: &str = "uuid";` A string column holding a UUID. `pub const VECTOR: &str = "vector";` A bytes column holding a vector of floats, `vector()`. `pub const WKT: &str = "wkt";` A string or bytes column holding a geometry, as WKT or WKB. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.