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