|DROP INDEX(7)||PostgreSQL 13.4 Documentation||DROP INDEX(7)|
DROP_INDEX - remove an index
DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] 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.
There are several caveats to be aware of when using this option. Only one index name can be specified, and the CASCADE option is not supported. (Thus, an index that supports a UNIQUE or PRIMARY KEY constraint cannot be dropped this way.) Also, regular DROP INDEX commands can be performed within a transaction block, but DROP INDEX CONCURRENTLY cannot. Lastly, indexes on partitioned tables cannot be dropped using this option.
For temporary tables, DROP INDEX is always non-concurrent, as no other session can access them, and non-concurrent index drop is cheaper.
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.
CREATE INDEX (CREATE_INDEX(7))