DROP CAST SQL - Language Statements DROP CAST remove a user-defined cast DROP CAST (sourcetype AS targettype) [ CASCADE | RESTRICT ] DROP CAST removes a previously defined cast. To be able to drop a cast, you must own the source or the target data type. These are the same privileges that are required to create a cast. sourcetype The name of the source data type of the cast. targettype The name of the target data type of the cast. CASCADE RESTRICT These key words do not have any effect, since there are no dependencies on casts. Use CREATE CAST to create user-defined casts. To drop the cast from type text to type int: DROP CAST (text AS int4); The DROP CAST command conforms to SQL99.