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I want to CREATE CAST a suitable function to convert 'character varying' to 'integer'. Can anyone suggest a function? Everything I try fails.
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Discussion: Use the :: operator to convert strings containing numeric values to the DECIMAL data type. In our example, we converted the string ' 5800.79 ' to 5800.79 (a DECIMAL value). This operator is used to convert between different data types.
The notations varchar( n ) and char( n ) are aliases for character varying( n ) and character( n ) , respectively. character without length specifier is equivalent to character(1) . If character varying is used without length specifier, the type accepts strings of any size. The latter is a PostgreSQL extension.
PostgreSQL supports a CAST operator that is used to convert a value of one type to another. Syntax: CAST ( expression AS target_type ); Let's analyze the above syntax: First, specify an expression that can be a constant, a table column, an expression that evaluates to a value.
VARCHAR is an alias for CHARACTER VARYING , so no difference, see documentation :) The notations varchar(n) and char(n) are aliases for character varying(n) and character(n) , respectively. character without length specifier is equivalent to character(1) .
Use this:
CREATE CAST (varchar AS integer) WITH INOUT [AS IMPLICIT];
It uses the input/output functions of the data types involved.
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