PostgreSQL User's Guide
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DROP FUNCTION

Name

DROP FUNCTION  --  Removes a user-defined C function

Synopsis

DROP FUNCTION name ( [ type [, ...] ] )

Inputs

name

The name of an existing function.

type

The type of function parameters.

Outputs

DROP

Message returned if the command completes successfully.

WARN RemoveFunction: Function "name" ("types") does not exist

This message is given if the function specified does not exist in the current database.

Description

DROP FUNCTION will remove references to an existing C function. To execute this command the user must be the owner of the function. The input argument types to the function must be specified, as only the function with the given name and argument types will be removed.

Notes

Refer to CREATE FUNCTION to create aggregate functions.

Usage

This command removes the square root function: 

DROP FUNCTION sqrt(int4);

Bugs

No checks are made to ensure that types, operators or access methods that rely on the function have been removed first.

Compatibility

DROP FUNCTION is a Postgres language extension.

SQL/PSM

SQL/PSM is a proposed standard to enable function extensibility. The SQL/PSM DROP FUNCTION statement has the following syntax: 

DROP [ SPECIFIC ] FUNCTION name { RESTRICT | CASCADE }

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