DROP INDEX — remove an index
DROP INDEX [ 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.
IF EXISTS
Do not throw an error if the index does not exist. A notice is issued in this case.
name
The name (optionally schema-qualified) of an index to remove.
CASCADE
Automatically drop objects that depend on the index.
RESTRICT
Refuse to drop the index if any objects depend on it. This is the default.