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')