DROP CAST

remove a cast

English manual coverage begins with PostgreSQL 6.4. Source history and runtime observations have their own recorded version boundaries.

Reading PG 18·Select a recorded version

anchor: SQL-DROPCAST
file: sql-dropcast.html
lang: en
name: DROP CAST
purpose: remove a cast
purpose zh: 移除一个类型转换
sections same as: Unknown
slug: 18
synopsis html: DROP CAST [ IF EXISTS ] (<em class="replaceable"><code>source_type</code></em> AS <em class="replaceable"><code>target_type</code></em>) [ CASCADE | RESTRICT ]
synopsis text: DROP CAST [ IF EXISTS ] (source_type AS target_type) [ CASCADE | RESTRICT ]

Syntax

DROP CAST [ IF EXISTS ] (source_type AS target_type) [ CASCADE | RESTRICT ]

Syntax diagrams

Read left to right. Branches are choices, bypasses are optional, loops repeat. Select an underlined parameter to open its rule.

DROP CAST [ IF EXISTS ] (source_type AS target_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 EXISTS: Do not throw an error if the cast does not exist. A notice is issued in this case.
source_type: The name of the source data type of the cast.
target_type: 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.

Definition sources

center · PostgreSQL 18 · wiki-repair-20261023:df5634259b2c5519fcb3736c9cc1cf2bcf5742cd8870b1e1e306dbcfa7282012

Text language: en · wiki-repair-20261023:df5634259b2c5519fcb3736c9cc1cf2bcf5742cd8870b1e1e306dbcfa7282012