經典SQL查詢題目

SQL查詢題目

<!--列表視圖頁顯示縮略圖和文章摘要--><!--文章視圖頁顯示所有內容--><!--若是有內容，顯示內容-->

 

SQL查詢題目

 

條件：

Student(Sno,Sname,Sage,Ssex) 學生表

Course(Cno,Cname,Tno) 課程表

SC(Sno,Cno,score) 成績表（選課表）

Teacher(Tno,Tname) 教師表

 

問題：

一、查詢「001」課程比「002」課程成績高的全部學生的學號；

  select a.sno from (select sno,score from SC where cno='001') a,(select sno,score

  from SC where cno='002') b

  where a.score>b.score and a.sno=b.sno;

 

二、查詢平均成績大於60分的同窗的學號和平均成績；

 select SNO,avg(score)  from sc  group by SNO having avg(score) >60;

三、查詢全部同窗的學號、姓名、選課數、總成績；

 select Student.SNO,Student.Sname,count(SC.CNO),sum(score)

 from Student left Outer join SC on Student.SNO=SC.SNO

 group by Student.SNO,Sname

四、查詢姓「李」的老師的個數；

 select count(distinct(Tname))

  from Teacher where Tname like '李%';

五、查詢沒學過「葉平」老師課的同窗的學號、姓名；

 select Student.SNO,Student.Sname  from Student 

 where SNO not in (select distinct(SC.SNO) from SC,Course,Teacher where  SC.CNO=Course.CNO and Teacher.Tno=Course.Tno and Teacher.Tname='葉平');

六、查詢學過「001」而且也學過編號「002」課程的同窗的學號、姓名；

select Student.SNO,Student.Sname from Student,SC where Student.SNO=SC.SNO and SC.CNO='001'and exists( Select * from SC as SC_2 where SC_2.SNO=SC.SNO and SC_2.CNO='002');

七、查詢學過「葉平」老師所教的全部課的同窗的學號、姓名；

select SNO,Sname

  from Student

  where SNO in (select SNO from SC ,Course ,Teacher where SC.CNO=Course.CNO and Teacher.TNO=Course.TNO and Teacher.Tname='葉平' group by SNO having count(SC.CNO)=(select count(CNO) from Course,Teacher  where Teacher.TNO=Course.TNO and Tname='葉平'));

八、查詢課程編號「002」的成績比課程編號「001」課程低的全部同窗的學號、姓名； 

Select SNO,Sname from (select Student.SNO,Student.Sname,score ,(select score from SC SC_2 where SC_2.SNO=Student.SNO and SC_2.CNO='002') score2

  from Student,SC where Student.SNO=SC.SNO and CNO='001') S_2 where score2 <score;

九、查詢全部課程成績小於60分的同窗的學號、姓名； 

select SNO,Sname

  from Student

  where SNO not in (select Student.SNO from Student,SC where S.SNO=SC.SNO and score>60);

十、查詢沒有學全全部課的同窗的學號、姓名；   

select Student.SNO,Student.Sname

    from Student,SC

    where Student.SNO=SC.SNO group by  Student.SNO,Student.Sname having count(CNO) <(select count(CNO) from Course);

 

十一、查詢至少有一門課與學號爲「1001」的同窗所學相同的同窗的學號和姓名；  

select SNO,Sname from Student,SC where Student.SNO=SC.SNO and CNO in select CNO from SC where SNO='1001';

十二、查詢至少學過學號爲「001」同窗全部一門課的其餘同窗學號和姓名； 

select distinct SC.SNO,Sname

    from Student,SC

    where Student.SNO=SC.SNO and CNO in (select CNO from SC where SNO='001');

1三、把「SC」表中「葉平」老師教的課的成績都更改成此課程的平均成績；

update SC set score=(select avg(SC_2.score)

    from SC SC_2

    where SC_2.CNO=SC.CNO) from Course,Teacher where Course.CNO=SC.CNO and Course.TNO=Teacher.TNO and Teacher.Tname='葉平');

   
1四、查詢和「1002」號的同窗學習的課程徹底相同的其餘同窗學號和姓名；

select SNO from SC where CNO in (select CNO from SC where SNO='1002')

    group by SNO having count(*)=(select count(*) from SC where SNO='1002');

   
1五、刪除學習「葉平」老師課的SC表記錄； 

DelectSC

    from course ,Teacher 

    where Course.CNO=SC.CNO and Course.TNO= Teacher.TNO and Tname='葉平';

1六、向SC表中插入一些記錄，這些記錄要求符合如下條件：沒有上過編號「003」課程的同窗學號、2號課的平均成績；   

Insert SC select SNO,'002',(Select avg(score)

    from SC where CNO='002') from Student where SNO not in (Select SNO from SC where CNO='002');

1七、查詢各科成績最高和最低的分：以以下形式顯示：課程ID，最高分，最低分 

SELECT SNO as 學生ID

        ,(SELECT score FROM SC WHERE SC.SNO=t.SNO AND CNO='004') AS 數據庫

        ,(SELECT score FROM SC WHERE SC.SNO=t.SNO AND CNO='001') AS 企業管理

        ,(SELECT score FROM SC WHERE SC.SNO=t.SNO AND CNO='006') AS 英語

        ,COUNT(*) AS 有效課程數, AVG(t.score) AS 平均成績

    FROM SC AS t

    GROUP BY SNO

    ORDER BY avg(t.score) 

1八、按各科平均成績從低到高和及格率的百分數從高到低順序   

SELECT t.CNO AS 課程號,max(course.Cname)AS 課程名,isnull(AVG(score),0) AS 平均成績

        ,100 * SUM(CASE WHEN  isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分數

    FROM SC T,Course

    where t.CNO=course.CNO

    GROUP BY t.CNO

    ORDER BY 100 * SUM(CASE WHEN  isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC

 

1九、查詢不一樣老師所教不一樣課程平均分從高到低顯示

SELECT max(Z.TNO) AS 教師ID,MAX(Z.Tname) AS 教師姓名,C.CNO AS 課程ＩＤ,MAX(C.Cname) AS 課程名稱,AVG(Score) AS 平均成績

    FROM SC AS T,Course AS C ,Teacher AS Z

    where T.CNO=C.CNO and C.TNO=Z.TNO

  GROUP BY C.CNO

  ORDER BY AVG(Score) DESC

 

20、統計列印各科成績,各分數段人數:課程ID,課程名稱,[100-85],[85-70],[70-60],[ <60]

SELECT SC.CNO as 課程ID, Cname as 課程名稱

        ,SUM(CASE WHEN score BETWEEN 85 AND 100 THEN 1 ELSE 0 END) AS [100 - 85]

        ,SUM(CASE WHEN score BETWEEN 70 AND 85 THEN 1 ELSE 0 END) AS [85 - 70]

        ,SUM(CASE WHEN score BETWEEN 60 AND 70 THEN 1 ELSE 0 END) AS [70 - 60]

        ,SUM(CASE WHEN score < 60 THEN 1 ELSE 0 END) AS [60 -]

    FROM SC,Course

    where SC.CNO=Course.CNO

    GROUP BY SC.CNO,Cname;

 

2一、查詢各科成績前三名的記錄:(不考慮成績並列狀況)   

SELECT t1.SNO as 學生ID,t1.CNO as 課程ID,Score as 分數

      FROM SC t1

      WHERE score IN (SELECT TOP 3 score

              FROM SC

              WHERE t1.CNO= CNO

            ORDER BY score DESC

              )

      ORDER BY t1.CNO;

2二、查詢每門課程被選修的學生數

select cno,count(SNO) from sc group by CNO;

2三、查詢出只選修了一門課程的所有學生的學號和姓名

select SC.SNO,Student.Sname,count(CNO) AS 選課數

  from SC ,Student

  where SC.SNO=Student.SNO group by SC.SNO ,Student.Sname having count(CNO)=1;

2四、查詢男生、女生人數

Select count(Ssex) as 男生人數from Student group by Ssex having Ssex='男';

Select count(Ssex) as 女生人數from Student group by Ssex having Ssex='女'；

2五、查詢姓「張」的學生名單 

SELECT Sname FROM Student WHERE Sname like '張%';

2六、查詢同名同性學生名單，並統計同名人數

select Sname,count(*) from Student group by Sname having  count(*)>1;

2七、1981年出生的學生名單(注：Student表中Sage列的類型是datetime)  

select Sname,  CONVERT(char (11),DATEPART(year,Sage)) as age

    from student

    where  CONVERT(char(11),DATEPART(year,Sage))='1981';

2八、查詢每門課程的平均成績，結果按平均成績升序排列，平均成績相同時，按課程號降序排列 

Select CNO,Avg(score) from SC group by CNO order by Avg(score),CNO DESC ;

2九、查詢平均成績大於85的全部學生的學號、姓名和平均成績

select Sname,SC.SNO ,avg(score)

    from Student,SC

    where Student.SNO=SC.SNO group by SC.SNO,Sname having  avg(score)>85;

30、查詢課程名稱爲「數據庫」，且分數低於60的學生姓名和分數

Select Sname,isnull(score,0)

    from Student,SC,Course

    where SC.SNO=Student.SNO and SC.CNO=Course.CNO and  Course.Cname='數據庫'and score <60;

3一、查詢全部學生的選課狀況；

SELECT SC.SNO,SC.CNO,Sname,Cname

    FROM SC,Student,Course

    where SC.SNO=Student.SNO and SC.CNO=Course.CNO ;

3二、查詢任何一門課程成績在70分以上的姓名、課程名稱和分數；

SELECT  distinct student.SNO,student.Sname,SC.CNO,SC.score

    FROM student,Sc

    WHERE SC.score>=70 AND SC.SNO=student.SNO;

3三、查詢不及格的課程，並按課程號從大到小排列

select cno from sc where scor e <60 order by CNO ;

3四、查詢課程編號爲003且課程成績在80分以上的學生的學號和姓名；

select SC.SNO,Student.Sname from SC,Student where SC.SNO=Student.SNO and Score>80 and CNO='003';

3五、求選了課程的學生人數

select count(*) from sc;

3六、查詢選修「葉平」老師所授課程的學生中，成績最高的學生姓名及其成績

select Student.Sname,score

    from Student,SC,Course C,Teacher

    where Student.SNO=SC.SNO and SC.CNO=C.CNO and C.TNO=Teacher.TNO and Teacher.Tname='葉平' and SC.score=(select max(score)from SC where CNO=C.CNO );

3七、查詢各個課程及相應的選修人數

select count(*) from sc group by CNO;

3八、查詢不一樣課程成績相同的學生的學號、課程號、學生成績

select distinct  A.SNO,B.score from SC A  ,SC B where A.Score=B.Score and A.CNO <>B.CNO ;

3九、查詢每門功成績最好的前兩名

SELECT t1.SNO as 學生ID,t1.CNO as 課程ID,Score as 分數

      FROM SC t1

      WHERE score IN (SELECT TOP 2 score

              FROM SC

              WHERE t1.CNO= CNO  

            ORDER BY score DESC

              )

      ORDER BY t1.CNO;

40、統計每門課程的學生選修人數（超過10人的課程才統計）。要求輸出課程號和選修人數，查詢結果按人數降序排列，查詢結果按人數降序排列，若人數相同，按課程號升序排列 

select  CNO as 課程號,count(*) as 人數

    from  sc 

    group  by  CNO

    order  by  count(*) desc,cno

4一、檢索至少選修兩門課程的學生學號

select  SNO 

    from  sc 

    group  by  sno

    having  count(*)  >  =  2

4二、查詢所有學生都選修的課程的課程號和課程名

select  CNO,Cname 

    from  Course 

    where  CNO  in  (select  cno  from  sc group  by  cno)

4三、查詢沒學過「葉平」老師講授的任一門課程的學生姓名

select Sname from Student where SNO not in (select SNO from Course,Teacher,SC where Course.TNO=Teacher.TNO and SC.CNO=course.CNO and Tname='葉平');

4四、查詢兩門以上不及格課程的同窗的學號及其平均成績

select SNO,avg(isnull(score,0)) from SC where SNO in (select SNO from SC where score <60 group by SNO having count(*)>2)group by SNO;

4五、檢索「004」課程分數小於60，按分數降序排列的同窗學號

select SNO from SC where CNO='004'and score <60 order by score desc;

4六、刪除「002」同窗的「001」課程的成績

delete from Sc where SNO='001'and CNO='001';