DB_CAST

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Updated at June 27, 2023

DB_CAST( expression, native_type [ , param_1 [ , param_2 ] ] )

Converts the expression expression to database's native type native_type.

The following type casts are supported:

Data source	Data type	Native data type	Parameters for native type	Comment
`ClickHouse`	`Date`	`Date`
`ClickHouse`	`Date`	`Date32`
`ClickHouse`	`Fractional number`	`Float32`
`ClickHouse`	`Fractional number`	`Float64`
`ClickHouse`	`Fractional number`	`Decimal`	`Integer`, `Integer`
`ClickHouse`	`Integer`	`Int8`
`ClickHouse`	`Integer`	`Int16`
`ClickHouse`	`Integer`	`Int32`
`ClickHouse`	`Integer`	`Int64`
`ClickHouse`	`Integer`	`UInt8`
`ClickHouse`	`Integer`	`UInt16`
`ClickHouse`	`Integer`	`UInt32`
`ClickHouse`	`Integer`	`UInt64`
`ClickHouse`	`String`	`String`
`PostgreSQL`	`Array of fractional numbers`	`double precision[]`
`PostgreSQL`	`Array of fractional numbers`	`real[]`
`PostgreSQL`	`Array of fractional numbers`	`numeric[]`	`Integer`, `Integer`
`PostgreSQL`	`Array of integers`	`smallint[]`
`PostgreSQL`	`Array of integers`	`integer[]`
`PostgreSQL`	`Array of integers`	`bigint[]`
`PostgreSQL`	`Array of strings`	`text[]`
`PostgreSQL`	`Array of strings`	`character varying[]`
`PostgreSQL`	`Array of strings`	`varchar[]`
`PostgreSQL`	`Fractional number`	`double precision`
`PostgreSQL`	`Fractional number`	`real`
`PostgreSQL`	`Fractional number`	`numeric`	`Integer`, `Integer`
`PostgreSQL`	`Integer`	`smallint`
`PostgreSQL`	`Integer`	`integer`
`PostgreSQL`	`Integer`	`bigint`
`PostgreSQL`	`String`	`text`
`PostgreSQL`	`String`	`character`	`Integer`	Alias: `char`
`PostgreSQL`	`String`	`character varying`	`Integer`	Alias: `varchar`
`PostgreSQL`	`String`	`char`	`Integer`	Alias for `character`
`PostgreSQL`	`String`	`varchar`	`Integer`	Alias for `character varying`

Argument types:

expression — Array of fractional numbers | Array of integers | Array of strings | Date | Fractional number | Integer | String
native_type — String
param_1 — Any
param_2 — Any

Return type: Same type as (expression)

Note

Only constant values are accepted for the arguments (native_type).

DB_CAST([float_value], "Decimal", 10, 5)

DB_CAST([float_value], "double precision")

DB_CAST([float_value], "numeric", 10, 5)

ClickHouse 21.8, PostgreSQL 9.3.