PostgreSQL 9.6.9 Documentation
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# DROP AGGREGATE

## Name

DROP AGGREGATE -- remove an aggregate function

## Synopsis

    DROP AGGREGATE [ IF EXISTS ] name ( aggregate_signature ) [ CASCADE | RESTRICT ]

    where aggregate_signature is:

    * |
    [ argmode ] [ argname ] argtype [ , ... ] |
    [ [ argmode ] [ argname ] argtype [ , ... ] ] ORDER BY [ argmode ] [ argname ] argtype [ , ... ]

## Description

`DROP AGGREGATE` removes an existing aggregate function. To execute this command the current user must be the owner of the aggregate function.

## Parameters

`IF EXISTS`

  Do not throw an error if the aggregate does not exist. A notice is issued in this case.

`name`

  The name (optionally schema-qualified) of an existing aggregate function.

`argmode`

  The mode of an argument: `IN` or `VARIADIC`. If omitted, the default is `IN`.

`argname`

  The name of an argument. Note that `DROP AGGREGATE` does not actually pay any attention to argument names, since only the argument data types are needed to determine the aggregate function's identity.

`argtype`

  An input data type on which the aggregate function operates. To reference a zero-argument aggregate function, write `*` in place of the list of argument specifications. To reference an ordered-set aggregate function, write `ORDER BY` between the direct and aggregated argument specifications.

`CASCADE`

  Automatically drop objects that depend on the aggregate function (such as views using it), and in turn all objects that depend on those objects (see Section 5.13).

`RESTRICT`

  Refuse to drop the aggregate function if any objects depend on it. This is the default.

## Notes

Alternative syntaxes for referencing ordered-set aggregates are described under ALTER AGGREGATE.

## Examples

To remove the aggregate function `myavg` for type `integer`:

    DROP AGGREGATE myavg(integer);

To remove the hypothetical-set aggregate function `myrank`, which takes an arbitrary list of ordering columns and a matching list of direct arguments:

    DROP AGGREGATE myrank(VARIADIC "any" ORDER BY VARIADIC "any");

## Compatibility

There is no `DROP AGGREGATE` statement in the SQL standard.

## See Also

ALTER AGGREGATE, CREATE AGGREGATE

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