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Historical version. PostgreSQL 7.3 reached end of support in November 2007. See the current version for supported releases.

PostgreSQL 7.3.21 Documentation
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DROP CAST

Name

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.

Parameters

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.

Read the upstream documentation. For corrections, first check the current version.

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