ALTER TRIGGER SQL - Language Statements ALTER TRIGGER change the definition of a trigger ALTER TRIGGER ALTER TRIGGER trigger ON table RENAME TO newname ALTER TRIGGER changes properties of an existing trigger. The RENAME clause changes the name of the given trigger without otherwise changing the trigger definition. You must own the table on which the trigger acts to be allowed to change its properties. trigger The name of an existing trigger to alter. table The name of the table on which this trigger acts. newname The new name for the trigger. ALTER TRIGGER Message returned if successful. ERROR If the trigger does not exist, or the new name is a duplicate of another existing trigger on the table. To rename an existing trigger: ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs; ALTER TRIGGER is a PostgreSQL extension of the SQL standard.