PostgreSQL 7.2.1 Documentation
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# DROP FUNCTION

## Name

DROP FUNCTION -- remove a user-defined function

## Synopsis

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

### Inputs

`name`

  The name of an existing function.

`type`

  The type of the function's parameters.

### Outputs

`DROP`

  Message returned if the command completes successfully.

`NOTICE 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 the definition of an existing function. To execute this command the user must be the owner of the function. The input argument types to the function must be specified, since several different functions may exist with the same name and different argument lists.

## Notes

Refer to CREATE FUNCTION for information on creating functions.

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

## Examples

This command removes the square root function:

    DROP FUNCTION sqrt(integer);

## Compatibility

A DROP FUNCTION statement is defined in SQL99. One of its syntax forms is:

    DROP FUNCTION name (arg, ...) { RESTRICT | CASCADE }

where `CASCADE` specifies dropping all objects that depend on the function and `RESTRICT` refuses to drop the function if dependent objects exist.

## See Also

CREATE FUNCTION

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