## table of contents

DROP FUNCTION(7) | PostgreSQL 13.4 Documentation | DROP FUNCTION(7) |

# NAME¶

DROP_FUNCTION - remove a function

# SYNOPSIS¶

DROP FUNCTION [ IF EXISTS ]name[ ( [ [argmode] [argname]argtype[, ...] ] ) ] [, ...]

[ CASCADE | RESTRICT ]

# DESCRIPTION¶

**DROP FUNCTION** removes the definition of an existing
function. To execute this command the user must be the owner of the
function. The argument types to the function must be specified, since
several different functions can exist with the same name and different
argument lists.

# PARAMETERS¶

IF EXISTS

*name*

*argmode*

**DROP FUNCTION**does not actually pay any attention to OUT arguments, since only the input arguments are needed to determine the function's identity. So it is sufficient to list the IN, INOUT, and VARIADIC arguments.

*argname*

**DROP FUNCTION**does not actually pay any attention to argument names, since only the argument data types are needed to determine the function's identity.

*argtype*

CASCADE

RESTRICT

# EXAMPLES¶

This command removes the square root function:

DROP FUNCTION sqrt(integer);

Drop multiple functions in one command:

DROP FUNCTION sqrt(integer), sqrt(bigint);

If the function name is unique in its schema, it can be referred to without an argument list:

DROP FUNCTION update_employee_salaries;

Note that this is different from

DROP FUNCTION update_employee_salaries();

which refers to a function with zero arguments, whereas the first variant can refer to a function with any number of arguments, including zero, as long as the name is unique.

# COMPATIBILITY¶

This command conforms to the SQL standard, with these PostgreSQL extensions:

# SEE ALSO¶

CREATE FUNCTION (CREATE_FUNCTION(7)), ALTER FUNCTION (ALTER_FUNCTION(7)), DROP PROCEDURE (DROP_PROCEDURE(7)), DROP ROUTINE (DROP_ROUTINE(7))

2021 | PostgreSQL 13.4 |