-- column_constraint, table_constraint:

CONSTRAINT,
NOT NULL, NULL,
CHECK ( .. ) NO INHERIT,
DEFAULT ..,
EXCLUDE USING .. ( .. WITH .. ) .. WHERE ( ..  ),
GENERATED ALWAYS AS IDENTITY,
GENERATED ALWAYS AS IDENTITY ( .. ),
GENERATED BY DEFAULT AS IDENTITY,
UNIQUE .., UNIQUE ( .. ),
PRIMARY KEY .., PRIMARY KEY ( .. ),
REFERENCES, REFERENCES .. ( .. ),
MATCH FULL, MATCH PARTIAL, MATCH SIMPLE,
ON DELETE .., ON UPDATE ..,
DEFERRABLE, NOT DEFERRABLE, INITIALLY DEFERRED, INITIALLY IMMEDIATE,
FOREIGN KEY ( .. ) REFERENCES,
USING INDEX bar,
INCLUDE ( .. ),
WITH ( .. ),
USING INDEX TABLESPACE;