DROP INDEX -- Removes an index from a database
DROP INDEX index_name
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 CREATE INDEX 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.