The following request is not valid because the constraint named no_such_constr does not exist in table_1. You cannot modify or drop it.
ALTER TABLE table_1 MODIFY CONSTRAINT no_such_constr CHECK (column_1 > 0);
The following request is not valid because the constraint named no_such_constr does not exist in table_1. You cannot modify or drop it.
ALTER TABLE table_1 MODIFY CONSTRAINT no_such_constr CHECK (column_1 > 0);