PostgreSQL 9.4.1 Documentation
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DROP MATERIALIZED VIEW

Name

DROP MATERIALIZED VIEW -- remove a materialized view

DROP MATERIALIZED VIEW [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]

DROP MATERIALIZED VIEW drops an existing materialized view. To execute this command you must be the owner of the materialized view.

IF EXISTS: Do not throw an error if the materialized view does not exist. A notice is issued in this case.
name: The name (optionally schema-qualified) of the materialized view to remove.
CASCADE: Automatically drop objects that depend on the materialized view (such as other materialized views, or regular views).
RESTRICT: Refuse to drop the materialized view if any objects depend on it. This is the default.

This command will remove the materialized view called order_summary:

DROP MATERIALIZED VIEW order_summary;

DROP MATERIALIZED VIEW is a PostgreSQL extension.