针对上一题中的关系,查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno[]‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) )
针对上一题中的关系,查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno[]‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) )
针对上一题中的关系,查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno<>‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) ) A: 正确 B: 错误
针对上一题中的关系,查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno<>‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) ) A: 正确 B: 错误
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。查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno[]‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) )
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。查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno[]‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) )
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。查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select snamefrom student swhere sno<;>;‘201815005’ and not exists(select *from sc xwhere x.sno='201815005' and not exists(select *from sc ywhere y.cno=x.cno and y.sno=s.sno ) )
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。查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select snamefrom student swhere sno<;>;‘201815005’ and not exists(select *from sc xwhere x.sno='201815005' and not exists(select *from sc ywhere y.cno=x.cno and y.sno=s.sno ) )
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。查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno<>‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) ) A: 正确 B: 错误
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。查询至少选修了“201815005”同学所选课程的学生的姓名,可以使用如下SQL语句。select sname from student swhere sno<>‘201815005’ and not exists (select * from sc x where x.sno='201815005' and not exists (select * from sc y where y.cno=x.cno and y.sno=s.sno ) ) A: 正确 B: 错误