DROP SEQUENCE

NAME

DROP SEQUENCE - remove a sequence

DROP SEQUENCE name [, ...] [ CASCADE | RESTRICT ]

DROP SEQUENCE removes sequence number generators.

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.

To remove the sequence serial:

DROP SEQUENCE serial;

There is no DROP SEQUENCE statement in the SQL standard.