ALTER AGGREGATE
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## ALTER AGGREGATE

ALTER AGGREGATE — change the definition of an aggregate function

## Synopsis

    ALTER AGGREGATE name ( aggregate_signature ) RENAME TO new_name
    ALTER AGGREGATE name ( aggregate_signature )
                    OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
    ALTER AGGREGATE name ( aggregate_signature ) SET SCHEMA new_schema

    where aggregate_signature is:

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

## Description

`ALTER AGGREGATE` changes the definition of an aggregate function.

You must own the aggregate function to use `ALTER AGGREGATE`. To change the schema of an aggregate function, you must also have `CREATE` privilege on the new schema. To alter the owner, you must be able to `SET ROLE` to the new owning role, and that role must have `CREATE` privilege on the aggregate function's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the aggregate function. However, a superuser can alter ownership of any aggregate function anyway.)

## Parameters

`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 `ALTER 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.

`new_name`

  The new name of the aggregate function.

`new_owner`

  The new owner of the aggregate function.

`new_schema`

  The new schema for the aggregate function.

## Notes

The recommended syntax for referencing an ordered-set aggregate is to write `ORDER BY` between the direct and aggregated argument specifications, in the same style as in `CREATE AGGREGATE`. However, it will also work to omit `ORDER BY` and just run the direct and aggregated argument specifications into a single list. In this abbreviated form, if `VARIADIC "any"` was used in both the direct and aggregated argument lists, write `VARIADIC "any"` only once.

## Examples

To rename the aggregate function `myavg` for type `integer` to `my_average`:

    ALTER AGGREGATE myavg(integer) RENAME TO my_average;

To change the owner of the aggregate function `myavg` for type `integer` to `joe`:

    ALTER AGGREGATE myavg(integer) OWNER TO joe;

To move the ordered-set aggregate `mypercentile` with direct argument of type `float8` and aggregated argument of type `integer` into schema `myschema`:

    ALTER AGGREGATE mypercentile(float8 ORDER BY integer) SET SCHEMA myschema;

This will work too:

    ALTER AGGREGATE mypercentile(float8, integer) SET SCHEMA myschema;

## Compatibility

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

## See Also

CREATE AGGREGATE, DROP AGGREGATE

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