問題文
A developer writes a CREATE TABLE statement and puts every constraint after the column list, at table level. The statement fails on one of them. Which constraint has to be written next to its column instead?
選択肢
- The constraint that limits the allowed values, because that one has to be given inline while every other kind can be given inline or at table level.
- The constraint that forbids duplicate values, because that one has to be given inline while every other kind can be given inline or at table level.
- The constraint that points at a parent table, because that one has to be given inline while other kinds may sit at table level.
- The constraint that forbids a null, because that one has to be given inline while every other kind can be given inline or at table level.