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 underlying function. To be able to drop a binary compatible cast, you must own both the source and 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. The privileges required to drop a cast may be changed in a future release. To drop the cast from type text to type int: DROP CAST (text AS int4); The DROP CAST command conforms to SQL99.