問題詳情

18)删除表s中字段c的SQL命令是
(A)ALTER TABLE s DELETE c
(B)ALTER TABLE s DROP c
(C)DELETE TABLE s DELETE c
(D)DELETE TABLE s DROP c

參考答案

答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)