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  • SQL基础五(作业代码)

    create database stuinfo
    create table student
    (
       mid char(10) not null primary key,
       mname char(50) not null
    )
    create table  course
    (
      fid char(10) not null primary key,
      fname char(50) not null
    )
    create table score
    (
       sid int identity(1,1) primary key,
       fid char(10) not null,
       mid char(10) not null,
       score int,
       foreign key(fid) references course(fid),
       foreign key(mid) references student(mid)
    )
    INSERT INTO course(FID,FName)VALUES('F001','语文') 
    INSERT INTO course(FID,FName)VALUES('F002','数学') 
    INSERT INTO course(FID,FName)VALUES('F003','英语') 
    INSERT INTO course(FID,FName)VALUES('F004','历史') 
    --学生表中插入数据-- 
    INSERT INTO student(MID,MName)VALUES('M001','张萨') 
    INSERT INTO student(MID,MName)VALUES('M002','王强') 
    INSERT INTO student(MID,MName)VALUES('M003','李三') 
    INSERT INTO student(MID,MName)VALUES('M004','李四') 
    INSERT INTO student(MID,MName)VALUES('M005','阳阳') 
    INSERT INTO student(MID,MName)VALUES('M006','虎子') 
    iNSERT INTO student(MID,MName)VALUES('M007','夏雪') 
    INSERT INTO student(MID,MName)VALUES('M008','璐璐') 
    INSERT INTO student(MID,MName)VALUES('M009','珊珊') 
    INSERT INTO student(MID,MName)VALUES('M010','香奈儿')
    
    INSERT INTO Score(FID,MID,Score)VALUES('F001','M001',78) 
    INSERT INTO Score(FID,MID,Score)VALUES('F002','M001',67) 
    INSERT INTO Score(FID,MID,Score)VALUES('F003','M001',89) 
    INSERT INTO Score(FID,MID,Score)VALUES('F004','M001',76) 
    INSERT INTO Score(FID,MID,Score)VALUES('F001','M002',89) 
    INSERT INTO Score(FID,MID,Score)VALUES('F002','M002',67) 
    INSERT INTO Score(FID,MID,Score)VALUES('F003','M002',84) 
    INSERT INTO Score(FID,MID,Score)VALUES('F004','M002',96) 
    INSERT INTO Score(FID,MID,Score)VALUES('F001','M003',70) 
    INSERT INTO Score(FID,MID,Score)VALUES('F002','M003',87) 
    INSERT INTO Score(FID,MID,Score)VALUES('F003','M003',92) 
    INSERT INTO Score(FID,MID,Score)VALUES('F004','M003',56) 
    INSERT INTO Score(FID,MID,Score)VALUES('F001','M004',80) 
    INSERT INTO Score(FID,MID,Score)VALUES('F002','M004',78) 
    INSERT INTO Score(FID,MID,Score)VALUES('F003','M004',97) 
    INSERT INTO Score(FID,MID,Score)VALUES('F004','M004',66) 
    INSERT INTO Score(FID,MID,Score)VALUES('F001','M006',88) 
    INSERT INTO Score(FID,MID,Score)VALUES('F002','M006',55)
    INSERT INTO Score(FID,MID,Score)VALUES('F003','M006',86) 
    INSERT INTO Score(FID,MID,Score)VALUES('F004','M006',79) 
    INSERT INTO Score(FID,MID,Score)VALUES('F002','M007',77) 
    INSERT INTO Score(FID,MID,Score)VALUES('F003','M008',65) 
    INSERT INTO Score(FID,MID,Score)VALUES('F004','M007',48) 
    INSERT INTO Score(FID,MID,Score)VALUES('F004','M009',75) 
    INSERT INTO Score(FID,MID,Score)VALUES('F002','M009',88)   
    select * from score
    select mname,语文=
                 max(case
                   when course.fname='语文' then score.score
                 end)
                ,数学=
                 max(case
                   when course.fname='数学' then score
                 end)
                ,英语=max(case
                   when course.fname='英语' then (score)
                 end)
                ,历史=max(case
                   when course.fname='历史' then (score)
                 end)
    from student,score,course 
    where student.mid=score.mid and score.fid=course.fid
    group by mname
    
    select   姓名=mname,课程=fname,成绩=score  from student,course,score where score<70 and student.mid=score.mid and score.fid=course.fid
    select 姓名=(select mname from student where mid=score.mid ),
           课程=(select fname from course where fid=score.fid),
           成绩=score
    from score where score<70
    --select * from score where score<70
    
    select 姓名=(select mname from student where mid=score.mid),平均分=avg(score)  from score group by mid order by 平均分 desc
    
    
    select distinct mid from score 
    select mid from student
    View Code
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  • 原文地址:https://www.cnblogs.com/tcheng/p/6076342.html
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