資料多重完整巢狀查詢語句

Student(SNO,Sname,Sage,Ssex) 學生表Course(CNO,Cname,TNO) 課程表

SC(SNO,CNO,score) 成績表

Teacher(TNO,Tname) 教師表

問題：

1、查詢“001”課程比“002”課程成績高的所有學生的學號；

Select a.SNO from (select Sno,score from SC where CNO='001') a,

(select Sno,scorefrom SC where CNO='002') b

Where a.score>b.score and a.Sno=b.Sno;
 

2、查詢平均成績大於60分的同學的學號和平均成績；

Select SNO,avg(score)

From sc

group by SNO having avg(score) >60;

3、查詢所有同學的學號、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

4、查詢姓“李”的老師的個數；

Select count(distinct(Tname))

From Teacher

Where Tname like '李%';

5、查詢沒學過“葉平”老師課的同學的學號、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');

6、查詢學過“001”並且也學過編號“002”課程的同學的學號、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');

7、查詢學過“葉平”老師所教的所有課的同學的學號、姓名；

selectSNO,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'));

8、查詢課程編號“002”的成績比課程編號“001”課程低的所有同學的學號、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;

9、查詢所有課程成績小於60分的同學的學號、姓名；

selectSNO,Sname

from  Student

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

10、查詢沒有學全所有課的同學的學號、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);

11、查詢至少有一門課與學號為“1001”的同學所學相同的同學的學號和姓名；

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

12、查詢至少學過學號為“001”同學所有一門課的其他同學學號和姓名；

Select  distinct SC.SNO,Sname

From Student,SC

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

13、把“SC”表中“葉平”老師教的課的成績都更改為此課程的平均成績；

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');

14、查詢和“1002”號的同學學習的課程完全相同的其他同學學號和姓名；

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');

15、刪除學習“葉平”老師課的SC表記錄；

Delect SC

from course ,Teacher

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

16、向SC表中插入一些記錄，這些記錄要求符合以下條件：沒有上過編號“003”課程的同學學號、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');

17、按平均成績從高到低顯示所有學生的“資料庫”、“企業管理”、“英語”三門的課程成績，按如下形式顯示： 學生ID,,資料庫,企業管理,英語,有效課程數,有效平均分

SELECT SNO as 學生ID

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

,(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)

18、查詢各科成績最高和最低的分：以如下形式顯示：課程ID，最高分，最低分

SELECT L.CNO As 課程ID,L.score AS 最高分,R.score AS 最低分

FROM SC L ,SC AS R

WHERE L.CNO = R.CNO and

L.score = (SELECT MAX(IL.score)

FROM SC AS IL,Student AS IM

WHERE L.CNO = IL.CNO and IM.SNO=IL.SNO

GROUP BY IL.CNO)

AND

R.Score = (SELECT MIN(IR.score)

FROM SC AS IR

WHERE R.CNO = IR.CNO

GROUP BY IR.CNO

);

19、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

wheret.CNO=course.CNO

GROUP BY t.CNO

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

20、查詢如下課程平均成績和及格率的百分數(用"1行"顯示): 企業管理（001），馬克思（002），OO&UML （003），資料庫（004）

SELECT SUM(CASE WHEN CNO ='001' THEN score ELSE 0 END)/SUM(CASE CNO WHEN '001' THEN 1 ELSE 0 END) AS 企業管理平均分

,100 * SUM(CASE WHEN CNO = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CNO = '001' THEN 1 ELSE 0 END) AS 企業管理及格百分數

,SUM(CASE WHEN CNO = '002' THEN score ELSE 0 END)/SUM(CASE CNO WHEN '002' THEN 1 ELSE 0 END) AS 馬克思平均分

,100 * SUM(CASE WHEN CNO = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CNO = '002' THEN 1 ELSE 0 END) AS 馬克思及格百分數

,SUM(CASE WHEN CNO = '003' THEN score ELSE 0 END)/SUM(CASE CNO WHEN '003' THEN 1 ELSE 0 END) AS UML平均分

,100 * SUM(CASE WHEN CNO = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CNO = '003' THEN 1 ELSE 0 END) AS UML及格百分數

,SUM(CASE WHEN CNO = '004' THEN score ELSE 0 END)/SUM(CASE CNO WHEN '004' THEN 1 ELSE 0 END) AS 資料庫平均分

,100 * SUM(CASE WHEN CNO = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CNO = '004' THEN 1 ELSE 0 END) AS 資料庫及格百分數

FROM SC

21、查詢不同老師所教不同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

22、查詢如下課程成績第 3 名到第 6 名的學生成績單：企業管理（001），馬克思（002），UML （003），資料庫（004）

[學生ID],[學生姓名],企業管理,馬克思,UML,資料庫,平均成績

SELECT  DISTINCT top 3

SC.SNO As 學生學號,

Student.Sname AS 學生姓名 ,

T1.score AS 企業管理,

T2.score AS 馬克思,

T3.score AS UML,

T4.score AS 資料庫,

ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 總分

FROM Student,SC  LEFT JOIN SC AS T1

ON SC.SNO = T1.SNO AND T1.CNO = '001'

LEFT JOIN SC AS T2

ON SC.SNO = T2.SNO AND T2.CNO = '002'

LEFT JOIN SC AS T3

ON SC.SNO = T3.SNO AND T3.CNO = '003'

LEFT JOIN SC AS T4

ON SC.SNO = T4.SNO AND T4.CNO = '004'

WHERE student.SNO=SC.SNO and

ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)

NOT IN

(SELECT

DISTINCT

TOP 15 WITH TIES

ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)

FROM sc

LEFT JOIN sc AS T1

ON sc.SNO = T1.SNO AND T1.CNO = 'k1'

LEFT JOIN sc AS T2

ON sc.SNO = T2.SNO AND T2.CNO = 'k2'

LEFT JOIN sc AS T3

ON sc.SNO = T3.SNO AND T3.CNO = 'k3'

LEFT JOIN sc AS T4

ON sc.SNO = T4.SNO AND T4.CNO = 'k4'

ORDER BY ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) DESC);

23、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;

24、查詢學生平均成績及其名次

SELECT 1+(SELECT COUNT( distinct 平均成績)

FROM (SELECT SNO,AVG(score) AS 平均成績

FROM SC

GROUP BY SNO

) AS T1

WHERE 平均成績 > T2.平均成績) as 名次,

SNO as 學生學號,平均成績

FROM (SELECT SNO,AVG(score) 平均成績

FROM SC

GROUP BY SNO

) AS T2

ORDER BY 平均成績 desc;

25、查詢各科成績前三名的記錄:(不考慮成績並列情況)

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;

26、查詢每門課程被選修的學生數

selectCno,count(SNO) from sc group by CNO;

27、查詢出只選修了一門課程的全部學生的學號和姓名

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;

28、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'；

29、查詢姓“張”的學生名單

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

30、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;;

31、1981年出生的學生名單(注：Student表中Sage列的型別是datetime)

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

from student

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

32、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 ;

33、查詢平均成績大於85的所有學生的學號、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;

34、查詢課程名稱為“資料庫”，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='資料庫'and score <60;

35、查詢所有學生的選課情況；

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

FROM SC,Student,Course

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

36、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  distinctstudent.SNO,student.Sname,SC.CNO,SC.score

FROM student,Sc

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

37、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 ;

38、查詢課程編號為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';

39、求選了課程的學生人數

Select  count(*)  from sc;

40、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,CourseC,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 );

41、查詢各個課程及相應的選修人數

select  count(*) from sc group by CNO;

42、查詢不同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 ;

43、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;

44、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  byCNO

order  by  count(*) desc,Cno

45、檢索至少選修兩門課程的學生學號

select  SNO

from  sc

group  bySno

having  count(*)  >  =  2

46、查詢全部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)

47、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');

48、查詢兩門以上不及格課程的同學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;

49、檢索“004”課程分數小於60，按分數降序排列的同學學號

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

50、刪除“002”同學的“001”課程的成績

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