DROP CAST — remove a cast
DROP CAST [ IF EXISTS ] (source_typeAStarget_type) [ 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.
IF EXISTSDo not throw an error if the cast does not exist. A notice is issued in this case.
source_typeThe name of the source data type of the cast.
target_typeThe name of the target data type of the cast.
CASCADERESTRICTThese key words do not have any effect, since there are no dependencies on casts.
To drop the cast from type text to type int:
DROP CAST (text AS int);
The DROP CAST command conforms to the SQL standard.