sqlserver

select STUDENT.Sno,SUM(Degree) as '总成绩' from Student,SC

where Ssex = '女' and Student.Sno = SC.Sno

group by Student.Sno;

 

select Cno,Degree from SC,Student

where SC.Sno = Student.Sno and Student.Sname='李勇';

 

select Course.Cno,Cname from Course,Teaching,Teacher

where Teacher.Tname = '李新' and Teacher.Tno = Teaching.Tno and Teaching.Cno = Course.Cno;

 

select Course.Cno,Cname from Course,Teaching,Teacher

where Teacher.Tsex='女' and Teacher.Tno = Teaching.Tno and Teaching.Cno = Course.Cno;

 

select Course.Cname from Course,Student,SC

where Student.Sname like '王%' and SC.Cno = Course.Cno and SC.Sno = Student.Sno;

 

select SC.Sno,SC.Degree from SC,Course

where Course.Cname='数据库' and Course.Cno = SC.Cno and SC.Degree between '80' and '90';

 

select AVG(YEAR(getdate())-year(Student.Sbirthday)) from Student,SC

where Student.Sno=SC.Sno and SC.Cno='C02';

 

select SC.Sno,Student.Sname from SC,Course,Student

where Course.Cname='数学' and SC.Cno = Course.Cno and Student.Sno = SC.Sno;

 

select Teaching.Cno,SC.Sno,SC.Degree from Teaching,SC,Teacher

where Teacher.Tname='钱军' and Teaching.Tno = Teacher.Tno and Teaching.Cno = SC.Cno;

 

select Teaching.Cno,SC.Sno,SC.Degree from Teaching,SC

1.         where Teaching.Cterm=3 and Teaching.Cno = SC.Cno;

 

二、嵌套查询

1.         查询至少选修两门课程的男学生姓名

2.         查询与李勇同一个系的其他同学姓名

3.         查询学号比刘晨同学大，而年龄比他小的学生姓名

4.         查询年龄大于所有女同学的男同学的姓名及系别

5.         查询成绩比该课程平均成绩高的学生的学号、课程号及成绩

6.         查询不讲授“C01”课的教师姓名

7.         查询没有选修“C02”课程的学生学号及姓名

8.         查询选修了“数据库”课程的学生学号、姓名及系别

9.         查询选修了全部课程的学生姓名

10.     分别用子查询和连接查询，求“C02”号课程在80分以上的学生信息