如下四個(gè)數(shù)據(jù)表

Student(SID, Sname, Sage, Ssex) 學(xué)生表
Course(CID, Cname, TID) 課程表
SC(SID, CID, score) 成績(jī)表
Teacher(TID, Tname) 教師表

注意 課程從001開始

問題：

1、查詢“001”課程比“002”課程成績(jī)高的所有學(xué)生的學(xué)號(hào)

select a.SID from (select Sid,score from SC where CID='001') a,(select Sid,score from SC where CID='002') b where a.score>b.score and a.Sid=b.Sid;

2、查詢平均成績(jī)大于60分的同學(xué)的學(xué)號(hào)和平均成績(jī)

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

3、查詢所有同學(xué)的學(xué)號(hào)、姓名、選課數(shù)、總成績(jī)

select Student.SID,Student.Sname,count(SC.CID),sum(score) from Student left Outer join SC on Student.SID=SC.SID group by Student.SID,Sname

4、查詢姓“李”的老師的個(gè)數(shù)

select count(distinct(Tname)) from Teacher where Tname like '李%';

5、查詢沒學(xué)過“葉平”老師課的同學(xué)的學(xué)號(hào)、姓名

select Student.SID,Student.Sname from Student where SID not in (select distinct(SC.SID) from SC,Course,Teacher where SC.CID=Course.CID and Teacher.TID=Course.TID and Teacher.Tname='葉平');

6、查詢學(xué)過“001”并且也學(xué)過編號(hào)“002”課程的同學(xué)的學(xué)號(hào)、姓名

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

7、查詢學(xué)過“葉平”老師所教的所有課的同學(xué)的學(xué)號(hào)、姓名

select SID,Sname from Student where SID in (select SID from SC ,Course ,Teacher where SC.CID=Course.CID and Teacher.TID=Course.TID and Teacher.Tname='葉平' group by SID having count(SC.CID)=(select count(CID) from Course,Teacher where Teacher.TID=Course.TID and Tname='葉平'));

8、查詢課程編號(hào)“002”的成績(jī)比課程編號(hào)“001”課程低的所有同學(xué)的學(xué)號(hào)、姓名

Select SID,Sname from (select Student.SID,Student.Sname,score ,(select score from SC SC_2 where SC_2.SID=Student.SID and SC_2.CID='002') score2 from Student,SC where Student.SID=SC.SID and CID='001') S_2 where score2 <score;

9、查詢所有課程成績(jī)小于60分的同學(xué)的學(xué)號(hào)、姓名

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

10、查詢沒有學(xué)全所有課的同學(xué)的學(xué)號(hào)、姓名

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

11、查詢至少有一門課與學(xué)號(hào)為“1001”的同學(xué)所學(xué)相同的同學(xué)的學(xué)號(hào)和姓名

select SID,Sname from Student,SC where Student.SID=SC.SID and CID in select CID from SC where SID='1001';

12、查詢至少學(xué)過學(xué)號(hào)為“001”同學(xué)所有一門課的其他同學(xué)學(xué)號(hào)和姓名

select distinct SC.SID,Sname from Student,SC where Student.SID=SC.SID and CID in (select CID from SC where SID='001');

13、把“SC”表中“葉平”老師教的課的成績(jī)都更改為此課程的平均成績(jī)

update SC set score=(select avg(SC_2.score) from SC SC_2 where SC_2.CID=SC.CID )from Course,Teacher where Course.CID=SC.CID and Course.TID=Teacher.TID and Teacher.Tname='葉平');

14、查詢和“1002”號(hào)的同學(xué)學(xué)習(xí)的課程完全相同的其他同學(xué)學(xué)號(hào)和姓名

select SID from SC where CID in (select CID from SC where SID='1002') group by SID having count(*)=(select count(*) from SC where SID='1002');

15、刪除學(xué)習(xí)“葉平”老師課的SC表記錄

Delect SC from course ,Teacher where Course.CID=SC.CID and Course.TID= Teacher.TID 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(hào)“003”課程的同學(xué)學(xué)號(hào)、002號(hào)課的平均成績(jī)

Insert SC select SID,'002',(Select avg(score) from SC where CID='002') from Student where SID not in (Select SID from SC where CID='002');

17、按平均成績(jī)從高到低顯示所有學(xué)生的“數(shù)據(jù)庫(kù)”、“企業(yè)管理”、“英語(yǔ)”三門的課程成績(jī)，按如下形式顯示：學(xué)生ID,數(shù)據(jù)庫(kù),企業(yè)管理,英語(yǔ),有效課程數(shù),有效平均分

SELECT SID as 學(xué)生ID ,(SELECT score FROM SC WHERE SC.SID=t.SID AND CID='004') AS 數(shù)據(jù)庫(kù) ,(SELECT score FROM SC WHERE SC.SID=t.SID AND CID='001') AS 企業(yè)管理 ,(SELECT score FROM SC WHERE SC.SID=t.SID AND CID='006') AS 英語(yǔ) ,COUNT(*) AS 有效課程數(shù), AVG(t.score) AS 平均成績(jī) FROM SC AS t GROUP BY SID ORDER BY avg(t.score)

18、查詢各科成績(jī)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.CID As 課程ID,L.score AS 最高分,R.score AS 最低分 FROM SC L ,SC AS R WHERE L.CID = R.CID and L.score = (SELECT MAX(IL.score) FROM SC AS IL,Student AS IM WHERE L.CID = IL.CID and IM.SID=IL.SID GROUP BY IL.CID) AND R.Score = (SELECT MIN(IR.score) FROM SC AS IR WHERE R.CID = IR.CID GROUP BY IR.CID);

19、按各科平均成績(jī)從低到高和及格率的百分?jǐn)?shù)從高到低順序

SELECT t.CID AS 課程號(hào),max(course.Cname)AS 課程名,isnull(AVG(score),0) AS 平均成績(jī) ,100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分?jǐn)?shù) FROM SC T,Course where t.CID=course.CID GROUP BY t.CID ORDER BY 100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) DESC

20、查詢?nèi)缦抡n程平均成績(jī)和及格率的百分?jǐn)?shù)(用"1行"顯示): 企業(yè)管理（001），馬克思（002），OO&UML （003），數(shù)據(jù)庫(kù)（004）

SELECT SUM(CASE WHEN CID ='001' THEN score ELSE 0 END)/SUM(CASE CID WHEN '001' THEN 1 ELSE 0 END) AS 企業(yè)管理平均分 ,100 * SUM(CASE WHEN CID = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CID = '001' THEN 1 ELSE 0 END) AS 企業(yè)管理及格百分?jǐn)?shù) ,SUM(CASE WHEN CID = '002' THEN score ELSE 0 END)/SUM(CASE CID WHEN '002' THEN 1 ELSE 0 END) AS 馬克思平均分 ,100 * SUM(CASE WHEN CID = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CID = '002' THEN 1 ELSE 0 END) AS 馬克思及格百分?jǐn)?shù) ,SUM(CASE WHEN CID = '003' THEN score ELSE 0 END)/SUM(CASE CID WHEN '003' THEN 1 ELSE 0 END) AS UML平均分 ,100 * SUM(CASE WHEN CID = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CID = '003' THEN 1 ELSE 0 END) AS UML及格百分?jǐn)?shù) ,SUM(CASE WHEN CID = '004' THEN score ELSE 0 END)/SUM(CASE CID WHEN '004' THEN 1 ELSE 0 END) AS 數(shù)據(jù)庫(kù)平均分 ,100 * SUM(CASE WHEN CID = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN CID = '004' THEN 1 ELSE 0 END) AS 數(shù)據(jù)庫(kù)及格百分?jǐn)?shù) 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.TID) AS 教師ID,MAX(Z.Tname) AS 教師姓名,C.CID AS 課程ＩＤ,MAX(C.Cname) AS 課程名稱,AVG(Score) AS 平均成績(jī) FROM SC AS T,Course AS C ,Teacher AS Z where T.CID=C.CID and C.TID=Z.TID GROUP BY C.CID ORDER BY AVG(Score) DESC

22、查詢?nèi)缦抡n程成績(jī)第 3 名到第 6 名的學(xué)生成績(jī)單：企業(yè)管理（001），馬克思（002），UML （003），數(shù)據(jù)庫(kù)（004） [學(xué)生ID],[學(xué)生姓名],企業(yè)管理,馬克思,UML,數(shù)據(jù)庫(kù),平均成績(jī)

SELECT DISTINCT top 3 SC.SID As 學(xué)生學(xué)號(hào), Student.Sname AS 學(xué)生姓名 , T1.score AS 企業(yè)管理, T2.score AS 馬克思, T3.score AS UML, T4.score AS 數(shù)據(jù)庫(kù), 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.SID = T1.SID AND T1.CID = '001' LEFT JOIN SC AS T2 ON SC.SID = T2.SID AND T2.CID = '002' LEFT JOIN SC AS T3 ON SC.SID = T3.SID AND T3.CID = '003' LEFT JOIN SC AS T4 ON SC.SID = T4.SID AND T4.CID = '004' WHERE student.SID=SC.SID 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.SID = T1.SID AND T1.CID = 'k1' LEFT JOIN sc AS T2 ON sc.SID = T2.SID AND T2.CID = 'k2' LEFT JOIN sc AS T3 ON sc.SID = T3.SID AND T3.CID = 'k3' LEFT JOIN sc AS T4 ON sc.SID = T4.SID AND T4.CID = 'k4' ORDER BY ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) DESC);

23、統(tǒng)計(jì)列印各科成績(jī),各分?jǐn)?shù)段人數(shù):課程ID,課程名稱,[100-85],[85-70],[70-60],[ <60]

SELECT SC.CID 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.CID=Course.CID GROUP BY SC.CID,Cname;

24、查詢學(xué)生平均成績(jī)及其名次

SELECT 1+(SELECT COUNT( distinct 平均成績(jī)) FROM (SELECT SID,AVG(score) AS 平均成績(jī) FROM SC GROUP BY SID ) AS T1 WHERE 平均成績(jī)> T2.平均成績(jī)) as 名次, SID as 學(xué)生學(xué)號(hào),平均成績(jī) FROM (SELECT SID,AVG(score) 平均成績(jī) FROM SC GROUP BY SID ) AS T2 ORDER BY 平均成績(jī)desc;

25、查詢各科成績(jī)前三名的記錄:(不考慮成績(jī)并列情況)

SELECT t1.SID as 學(xué)生ID,t1.CID as 課程ID,Score as 分?jǐn)?shù) FROM SC t1 WHERE score IN (SELECT TOP 3 score FROM SC WHERE t1.CID= CID ORDER BY score DESC ) ORDER BY t1.CID;

26、查詢每門課程被選修的學(xué)生數(shù)

select Cid,count(SID) from sc group by CID;

27、查詢出只選修了一門課程的全部學(xué)生的學(xué)號(hào)和姓名

select SC.SID,Student.Sname,count(CID) AS 選課數(shù) from SC ,Student where SC.SID=Student.SID group by SC.SID ,Student.Sname having count(CID)=1;

28、查詢男生、女生人數(shù)

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

29、查詢姓“張”的學(xué)生名單

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

30、查詢同名同性學(xué)生名單，并統(tǒng)計(jì)同名人數(shù)

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

31、1981年出生的學(xué)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';

32、查詢每門課程的平均成績(jī)，結(jié)果按平均成績(jī)升序排列，平均成績(jī)相同時(shí)，按課程號(hào)降序排列

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

33、查詢平均成績(jī)大于85的所有學(xué)生的學(xué)號(hào)、姓名和平均成績(jī)

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

34、查詢課程名稱為“數(shù)據(jù)庫(kù)”，且分?jǐn)?shù)低于60的學(xué)生姓名和分?jǐn)?shù)

Select Sname,isnull(score,0) from Student,SC,Course where SC.SID=Student.SID and SC.CID=Course.CID and Course.Cname='數(shù)據(jù)庫(kù)'and score <60;

35、查詢所有學(xué)生的選課情況；

SELECT SC.SID,SC.CID,Sname,Cname FROM SC,Student,Course where SC.SID=Student.SID and SC.CID=Course.CID ;

36、查詢?nèi)魏我婚T課程成績(jī)?cè)?0分以上的姓名、課程名稱和分?jǐn)?shù)；

SELECT distinct student.SID,student.Sname,SC.CID,SC.score FROM student,Sc WHERE SC.score>=70 AND SC.SID=student.SID;

37、查詢不及格的課程，并按課程號(hào)從大到小排列

select Cid from sc where scor e <60 order by CID ;

38、查詢課程編號(hào)為003且課程成績(jī)?cè)?0分以上的學(xué)生的學(xué)號(hào)和姓名

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

39、求選了課程的學(xué)生人數(shù)

select count(*) from sc;

40、查詢選修“葉平”老師所授課程的學(xué)生中，成績(jī)最高的學(xué)生姓名及其成績(jī)

select Student.Sname,score from Student,SC,CourseC,Teacher where Student.SID=SC.SID and SC.CID=C.CID and C.TID=Teacher.TID and Teacher.Tname='葉平' and SC.score=(select max(score)from SC where CID=C.CID );

41、查詢各個(gè)課程及相應(yīng)的選修人數(shù)

select count(*) from sc group by CID;

42、查詢不同課程成績(jī)相同的學(xué)生的學(xué)號(hào)、課程號(hào)、學(xué)生成績(jī)

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

43、查詢每門功成績(jī)最好的前兩名

SELECT t1.SID as 學(xué)生ID,t1.CID as 課程ID,Score as 分?jǐn)?shù) FROM SC t1 WHERE score IN (SELECT TOP 2 score FROM SC WHERE t1.CID= CID ORDER BY score DESC ) ORDER BY t1.CID;

44、統(tǒng)計(jì)每門課程的學(xué)生選修人數(shù)（超過10人的課程才統(tǒng)計(jì)）。要求輸出課程號(hào)和選修人數(shù)，查詢結(jié)果按人數(shù)降序排列，查詢結(jié)果按人數(shù)降序排列，若人數(shù)相同，按課程號(hào)升序排列

select CID as 課程號(hào),count(*) as 人數(shù) from sc group by CID order by count(*) desc,Cid

45、檢索至少選修兩門課程的學(xué)生學(xué)號(hào)

select SID from sc group by Sid having count(*) > = 2

46、查詢?nèi)繉W(xué)生都選修的課程的課程號(hào)和課程名

select CID,Cname from Course where CID in (select Cid from sc group by Cid)

47、查詢沒學(xué)過“葉平”老師講授的任一門課程的學(xué)生姓名

select Sname from Student where SID not in (select SID from Course,Teacher,SC where Course.TID=Teacher.TID and SC.CID=course.CID and Tname='葉平');

48、查詢兩門以上不及格課程的同學(xué)的學(xué)號(hào)及其平均成績(jī)

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

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