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PostgreSQL 8.0.18 Documentation
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DROP CAST

Name

DROP CAST -- remove a 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.

To drop the cast from type text to type int:

DROP CAST (text AS int);

The DROP CAST command conforms to the SQL standard.

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