DROP COLLATION

remove a collation

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-DROPCOLLATION
file: sql-dropcollation.html
lang: en
name: DROP COLLATION
purpose: remove a collation
purpose zh: 删除一个排序规则
sections same as: Unknown
slug: 18
synopsis html: DROP COLLATION [ IF EXISTS ] <em class="replaceable"><code>name</code></em> [ CASCADE | RESTRICT ]
synopsis text: DROP COLLATION [ IF EXISTS ] name [ CASCADE | RESTRICT ]

Syntax

DROP COLLATION [ IF EXISTS ] name [ 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 COLLATION [ IF EXISTS ] name [ CASCADE | RESTRICT ]

DROP COLLATION removes a previously defined collation. To be able to drop a collation, you must own the collation.

IF EXISTS: Do not throw an error if the collation does not exist. A notice is issued in this case.
name: The name of the collation. The collation name can be schema-qualified.
CASCADE: Automatically drop objects that depend on the collation, and in turn all objects that depend on those objects (see Section 5.15).
RESTRICT: Refuse to drop the collation if any objects depend on it. This is the default.

To drop the collation named german:

DROP COLLATION german;

The DROP COLLATION command conforms to the SQL standard, apart from the IF EXISTS option, which is a PostgreSQL extension.

Definition sources

center · PostgreSQL 18 · wiki-repair-20261023:58cea45d52788afa62361d422e8dbcb455137bc914c53587d7a20bfe5a814d37

Text language: en · wiki-repair-20261023:58cea45d52788afa62361d422e8dbcb455137bc914c53587d7a20bfe5a814d37