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PostgreSQL 7.4.21 Documentation
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ALTER AGGREGATE

Name

ALTER AGGREGATE -- change the definition of an aggregate function

ALTER AGGREGATE name ( type ) RENAME TO newname

ALTER AGGREGATE changes the definition of an aggregate function. The only currently available functionality is to rename the aggregate function.

name: The name (optionally schema-qualified) of an existing aggregate function.
type: The argument data type of the aggregate function, or * if the function accepts any data type.
newname: The new name of the aggregate function.

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

ALTER AGGREGATE myavg(integer) RENAME TO my_average;

There is no ALTER AGGREGATE statement in the SQL standard.