查询选修了课程号为\'C2\'的学生号和姓名,若用下列SQL的SELECT语句表达时,哪一个是错误的

Question

查询选修了课程号为\'C2\'的学生号和姓名，若用下列SQL的SELECT语句表达时，哪一个是错误的？

A．SELECT S.S#，SNAME FROM S WHERE S.S#

= （SELECT SC．S# FROM SC WHERE C# = 'C2' ）

B．SELECT S.S#，SNAME FROM S，SC

WHERE S.S# = SC．S# AND C# = 'C2'

C．SELECT S.S#，SNAME FROM S，SC

WHERE S.S# = SC．S# AND C# = 'C2' ORDER BY S.S#

D．SELECT S.S#，SNAME FROM S WHERE S.S#

IN （SELECT SC．S# FROM SC WHERE C# ='C2' ）

Answer 1

正确答案：A