DROP_EXTENSION - remove an extension
DROP EXTENSION [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]DROP EXTENSION removes extensions from the database. Dropping an extension causes its member objects, and other explicitly dependent routines (see ALTER ROUTINE (ALTER_ROUTINE(7)), the DEPENDS ON EXTENSION extension_name action), to be dropped as well.
You must own the extension to use DROP EXTENSION.
IF EXISTS
Do not throw an error if the extension does not exist. A notice is issued in this case.
name
The name of an installed extension.
CASCADE
Automatically drop objects that depend on the extension, and in turn all objects that depend on those objects (see Section 5.14).
RESTRICT
This option prevents the specified extensions from being dropped if other objects, besides these extensions, their members, and their explicitly dependent routines, depend on them. This is the default.
To remove the extension hstore from the current database:
DROP EXTENSION hstore;
This command will fail if any of hstores objects are in use in the database, for example if any tables have columns of the hstore type. Add the CASCADE option to forcibly remove those dependent objects as well.
DROP EXTENSION is a PostgreSQL extension.
CREATE EXTENSION (CREATE_EXTENSION(7)), ALTER EXTENSION (ALTER_EXTENSION(7))