Student(S#,Sname,Sage,Ssex) 學生表
　　S#：學號; Sname： 學生姓名; Sage：學生年齡; Ssex：學生性別
　　Course(C#,Cname,T#) 課程表
　　C#,課程編號;Cname：課程名字;T#：教師編號
　　SC(S#,C#,score) 成績表
　　S#：學號;C#,課程編號;score：成績
　　Teacher(T#,Tname) 教師表
　　T#：教師編號; Tname：教師名字
　　
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.S# from (select s#,score from SC where C#='001') a,(select s#,score from SC where C#='002') b where a.score>b.score and a.s#=b.s#;

　　
　　2、查詢平均成績大于60分的同學的學號和平均成績;
　　

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

　　3、查詢所有同學的學號、姓名、選課數、總成績;
　　

select Student.S#,Student.Sname,count(SC.C#),sum(score) from Student left Outer join SC on Student.S#=SC.S# group by Student.S#,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.S#,Student.Sname from Student where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='葉平');

　　6、查詢學過“001”并且也學過編號“002”課程的同學的學號、姓名;
　　

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

　　7、查詢學過“葉平”老師所教的所有課的同學的學號、姓名;
　

select S#,Sname from Student where S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname='葉平' group by S# having count(SC.C#)=(select count(C#) from Course,Teacher where Teacher.T#=Course.T# 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 S#,Sname from (select Student.S#,Student.Sname,score ,(select score from SC SC_2 where SC_2.S#=Student.S# and SC_2.C#='002') score2 from Student,SC where Student.S#=SC.S# and C#='001') S_2 where score2

　　9、查詢所有課程成績小于60分的同學的學號、姓名;
　

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

　　10、查詢沒有學全所有課的同學的學號、姓名;
　　

select Student.S#,Student.Snamefrom Student,SCwhere Student.S#=SC.S# group by Student.S#,Student.Sname having count(C#) <(select count(C#) 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 S#,Sname from Student,SC where Student.S#=SC.S# and C# in select C# from SC where S#='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.S#,Snamefrom Student,SCwhere Student.S#=SC.S# and C# in (select C# from SC where S#='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_2where SC_2.C#=SC.C# ) from Course,Teacher where Course.C#=SC.C# and Course.T#=Teacher.T# 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 S# from SC where C# in (select C# from SC where S#='1002')group by S# having count(*)=(select count(*) from SC where S#='1002');

　　15、刪除學習“葉平”老師課的SC表記錄;
　

　Delect SCfrom course ,Teacherwhere Course.C#=SC.C# and Course.T#= Teacher.T# 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 S#,'002',(Select avg(score)from SC where C#='002') from Student where S# not in (Select S# from SC where C#='002');

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

SELECT S# as 學生ID,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='004') AS 數據庫,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='001') AS 企業管理,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='006') AS 英語,COUNT(*) AS 有效課程數, AVG(t.score) AS 平均成績FROM SC AS tGROUP BY S#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.C# As 課程ID,L.score AS 最高分,R.score AS 最低分FROM SC L ,SC AS RWHERE L.C# = R.C# andL.score = (SELECT MAX(IL.score)FROM SC AS IL,Student AS IMWHERE L.C# = IL.C# and IM.S#=IL.S#GROUP BY IL.C#)ANDR.Score = (SELECT MIN(IR.score)FROM SC AS IRWHERE R.C# = IR.C#GROUP BY IR.C#);

　　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.C# 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,Coursewhere t.C#=course.C#GROUP BY t.C#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)，數據庫(004)
　

　SELECT SUM(CASE WHEN C# ='001' THEN score ELSE 0 END)/SUM(CASE C# WHEN '001' THEN 1 ELSE 0 END) AS 企業管理平均分,100 * SUM(CASE WHEN C# = '001' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '001' THEN 1 ELSE 0 END) AS 企業管理及格百分數,SUM(CASE WHEN C# = '002' THEN score ELSE 0 END)/SUM(CASE C# WHEN '002' THEN 1 ELSE 0 END) AS 馬克思平均分,100 * SUM(CASE WHEN C# = '002' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '002' THEN 1 ELSE 0 END) AS 馬克思及格百分數,SUM(CASE WHEN C# = '003' THEN score ELSE 0 END)/SUM(CASE C# WHEN '003' THEN 1 ELSE 0 END) AS UML平均分,100 * SUM(CASE WHEN C# = '003' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '003' THEN 1 ELSE 0 END) AS UML及格百分數,SUM(CASE WHEN C# = '004' THEN score ELSE 0 END)/SUM(CASE C# WHEN '004' THEN 1 ELSE 0 END) AS 數據庫平均分,100 * SUM(CASE WHEN C# = '004' AND score >= 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = '004' THEN 1 ELSE 0 END) AS 數據庫及格百分數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.T#) AS 教師ID,MAX(Z.Tname) AS 教師姓名,C.C# 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 Zwhere T.C#=C.C# and C.T#=Z.T#GROUP BY C.C#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)，數據庫(004)
　　[學生ID],[學生姓名],企業管理,馬克思,UML,數據庫,平均成績
　

　SELECT DISTINCT top 3SC.S# 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 數據庫,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 T1ON SC.S# = T1.S# AND T1.C# = '001'LEFT JOIN SC AS T2ON SC.S# = T2.S# AND T2.C# = '002'LEFT JOIN SC AS T3ON SC.S# = T3.S# AND T3.C# = '003'LEFT JOIN SC AS T4ON SC.S# = T4.S# AND T4.C# = '004'WHERE student.S#=SC.S# andISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)NOT IN(SELECTDISTINCTTOP 15 WITH TIESISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0)FROM scLEFT JOIN sc AS T1ON sc.S# = T1.S# AND T1.C# = 'k1'LEFT JOIN sc AS T2ON sc.S# = T2.S# AND T2.C# = 'k2'LEFT JOIN sc AS T3ON sc.S# = T3.S# AND T3.C# = 'k3'LEFT JOIN sc AS T4ON sc.S# = T4.S# AND T4.C# = '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.C# 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,Coursewhere SC.C#=Course.C#GROUP BY SC.C#,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 S#,AVG(score) AS 平均成績FROM SCGROUP BY S#) AS T1WHERE 平均成績 > T2.平均成績) as 名次,S# as 學生學號,平均成績FROM (SELECT S#,AVG(score) 平均成績FROM SCGROUP BY S#) AS T2ORDER BY 平均成績 desc;

　　25、查詢各科成績前三名的記錄:(不考慮成績并列情況)
　　

SELECT t1.S# as 學生ID,t1.C# as 課程ID,Score as 分數FROM SC t1WHERE score IN (SELECT TOP 3 scoreFROM SCWHERE t1.C#= C#ORDER BY score DESC)ORDER BY t1.C#;

　　26、查詢每門課程被選修的學生數
　　

select c#,count(S#) from sc group by C#;

　　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.S#,Student.Sname,count(C#) AS 選課數from SC ,Studentwhere SC.S#=Student.S# group by SC.S# ,Student.Sname having count(C#)=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，并統計同名人數
　　

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列的類型是datetime)
　　

select Sname, CONVERT(char (11),DATEPART(year,Sage)) as agefrom studentwhere 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 C#,Avg(score) from SC group by C# order by Avg(score),C# DESC ;

　　33、查詢平均成績大于85的所有學生的學號、姓名和平均成績
　　

select Sname,SC.S# ,avg(score)from Student,SCwhere Student.S#=SC.S# group by SC.S#,Sname having avg(score)>85;

　　34、查詢課程名稱為“數據庫”，且分數低于60的學生姓名和分數
　

　Select Sname,isnull(score,0)from Student,SC,Coursewhere SC.S#=Student.S# and SC.C#=Course.C# and Course.Cname='數據庫'and score <60;

　　35、查詢所有學生的選課情況;
　　

SELECT SC.S#,SC.C#,Sname,CnameFROM SC,Student,Coursewhere SC.S#=Student.S# and SC.C#=Course.C# ;

　　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 distinct student.S#,student.Sname,SC.C#,SC.scoreFROM student,ScWHERE SC.score>=70 AND SC.S#=student.S#;

　　37、查詢不及格的課程，并按課程號從大到小排列
　

　select c# from sc where scor e <60 order by C# ;

　　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.S#,Student.Sname from SC,Student where SC.S#=Student.S# and Score>80 and C#='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,scorefrom Student,SC,Course C,Teacherwhere Student.S#=SC.S# and SC.C#=C.C# and C.T#=Teacher.T# and Teacher.Tname='葉平' and SC.score=(select max(score)from SC where C#=C.C# );

　　41、查詢各個課程及相應的選修人數

　　select count(*) from sc group by C#;

　　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.S#,B.score from SC A ,SC B where A.Score=B.Score and A.C# <>B.C# ;

　　43、查詢每門功成績最好的前兩名
　

　SELECT t1.S# as 學生ID,t1.C# as 課程ID,Score as 分數FROM SC t1WHERE score IN (SELECT TOP 2 scoreFROM SCWHERE t1.C#= C#ORDER BY score DESC)ORDER BY t1.C#;

　　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 C# as 課程號,count(*) as 人數from scgroup by C#order by count(*) desc,c#45、檢索至少選修兩門課程的學生學號select S#from scgroup by s#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 C#,Cnamefrom Coursewhere C# in (select c# from sc group by c#)

　　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 S# not in (select S# from Course,Teacher,SC where Course.T#=Teacher.T# and SC.C#=course.C# 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 S#,avg(isnull(score,0)) from SC where S# in (select S# from SC where score <60 group by S# having count(*)>2)group by S#;

　　49、檢索“004”課程分數小于60，按分數降序排列的同學學號
　　

select S# from SC where C#='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 S#='002'and C#='001';

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