单项选择题
A.SELECT phone FROM authors WHERE phone LIKE’4[1,0]%’ B.SELECT phone FROM authors WHERE phonein’4[^10]%’ C.SELECT phone FROM authors WHERE phone LIKE’4_[1,0]%’ D.SELECT phone FROM authors WHERE phone between’41%’and’40%’
A.Select email from student where email !=null B.Select email from student where email not is null C.Select email from student where email<>null D.Select email from student where email is no tnull
A.错误提示:orderby子句中不能出现表达式。 B.正确执行,显示grade表中各列值,按照score由低到高排序。 C.正确执行,显示grade表中各列值,以及加权成绩列,按照score由低到高排序。 D.错误提示:where子句中不能出现表达式。