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  1. Function reference
  2. Type conversion functions
  3. DB_CAST

DB_CAST

    Syntax

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

    Description

    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 Number (decimal) Float32
    ClickHouse Number (decimal) Float64
    ClickHouse Number (decimal) Decimal Number (whole), Number (whole)
    ClickHouse Number (whole) Int8
    ClickHouse Number (whole) Int16
    ClickHouse Number (whole) Int32
    ClickHouse Number (whole) Int64
    ClickHouse String String
    PostgreSQL Number (decimal) double precision
    PostgreSQL Number (decimal) real
    PostgreSQL Number (decimal) numeric Number (whole), Number (whole)
    PostgreSQL Number (whole) smallint
    PostgreSQL Number (whole) integer
    PostgreSQL Number (whole) bigint
    PostgreSQL String text
    PostgreSQL String character Number (whole) Alias: char
    PostgreSQL String character varying Number (whole) Alias: varchar
    PostgreSQL String char Number (whole) Alias for character
    PostgreSQL String varchar Number (whole) Alias for character varying

    Argument types:

    • expression — Number | String
    • native_type — String
    • param_1 — Any
    • param_2 — Any

    Return type: Same type as (expression)

    Note

    Only constant values are accepted for arguments (native_type).

    Examples

    DB_CAST([float_value], "Decimal", 10, 5)
    
    DB_CAST([float_value], "double precision")
    
    DB_CAST([float_value], "numeric", 10, 5)
    

    Data source support

    Materialized Dataset, ClickHouse 1.1, PostgreSQL 9.3.

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