DROP INDEX index_name
The name of the index to remove.
The message returned if the index is successfully dropped.
This message occurs if index_name is not an index in the database.
DROP INDEX drops an existing index from the database system. To execute this command you must be the owner of the index.
DROP INDEX is a Postgres language extension.
Refer to the CREATE INDEX statement for information on how to create indexes.
This command will remove the title_idx index:
DROP INDEX title_idx;
SQL92 defines commands by which to access a generic relational database. Indexes are an implementation-dependent feature and hence there are no index-specific commands or definitions in the SQL92 language.
Read the upstream documentation. For corrections, first check the current manual.