ALTER AGGREGATE SQL - Language Statements ALTER AGGREGATE change the definition of an aggregate function ALTER AGGREGATE 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.