在学生选课数据库中有学生表student(sno,sname,ssex,sage,sdept),课程表course(cno,cname)及学生选课表sc(sno,cno,grade),其中sno是学号,sname是姓名,ssex是性别,sage是年龄,sdept是系别,cno是课程号,cname是课程名,grade是成绩。以下( )SQL语句可以实现查询选修了'C002'号课程的学生姓名。
选项:
A:select sname from student, sc where student.sno=sc.sno and cno='C002';
B:select sname from student where sno in (select sno from sc where cno='C002');
C:select sname from student where sno = (select sno from sc where cno='C002');
D:select sname from student where exixts (select * from sc where student.sno=sc.sno and cno='C002')
发布时间:2024-05-07 19:28:36