exec
CREATE TABLE checks (a INTEGER PRIMARY KEY, b INTEGER, c varchar(20))
----

exec
ALTER TABLE checks ADD CONSTRAINT chk1 CHECK (B > 0)
----

exec
ALTER TABLE checks ADD CONSTRAINT chk2 CHECK (b > 0) NOT ENFORCED
----

exec
ALTER TABLE checks ADD CONSTRAINT chk3 CHECK (B > 1)
----

exec
ALTER TABLE checks ADD CONSTRAINT chk4 CHECK (upper(C) = c)
----
