单选题 查询选修了课程号为“C1”的学生的姓名和年龄,若用下列SQL的SELECT语句表达时,错误的是( )。
A.SELECT SNAME,AGE FROM S WHERE S.S#=(SELECT SC.S#FROM SC
WHERE C.C#='C1')
B.SELECT SNAME,AGE FROM S,SC WHERE S.S#=SC.S# AND SC.C#='C1'
C.SELECT SNAME,AGE FROM S,SC WHERE S.S#=SC.S# AND SC.C#='C1'
ORDERBY S.S#
D.SELECT SNAME,AGE FROM S WHERE S.S#=(SELECT SC.S# FROM SC
WHERE SC.C#='C1')

【正确答案】 A
【答案解析】