题型:名词解释 若用如下的SQL语句创建了一个表S: CREATE TABLES(S# CHAR(6)NOT NULL, SNAME CHAR (8) NOT NULL,SEX CHAR(2),AGE INTEGER) 今向S表插入如下行时,哪一行可以被插入 ( )。A.('991001',‘李明芳’,女,'23')B.('990746',“张为’,NULL,NULC.(NULL,‘陈道一’,‘男’,32)D.('992345',NULL,‘女’,25) 查看答案
题型:名词解释 I _____ have been more than six years old when the accident happened. [ ]A. shouldn't B. couldn't C. mustn't D. needn't 查看答案