PostgreSQL Manual
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DROP INDEX name [, ...] [ CASCADE | RESTRICT ]
DROP INDEX drops an existing index from the database system. To execute this command you must be the owner of the index.
The name (optionally schema-qualified) of an index to remove.
Automatically drop objects that depend on the index.
Refuse to drop the index if any objects depend on it. This is the default.
This command will remove the index title_idx:
DROP INDEX title_idx;
DROP INDEX is a PostgreSQL language extension. There are no provisions for indexes in the SQL standard.