生成表和數據

create table STUDENT(  
SNO varchar2(10) primary key,  
NAME varchar2(20),  
AGE number(2),  
SEX varchar2(5)  
);  
create table TEACHER(  
TNO varchar2(10) primary key,  
NAME varchar2(20)  
);  
create table COURSE(  
CNO varchar2(10) primary key,  
NAME varchar2(20),  
TNO varchar2(20)  
);  
create table SC(  
SNO varchar2(10),  
CNO varchar2(10),  
SCORE number(4,2)
);

初始化學生表的數據

insert into STUDENT values ('s001','張三',23,'男');  
insert into STUDENT values ('s002','李四',23,'男');  
insert into STUDENT values ('s003','吳鵬',25,'男');  
insert into STUDENT values ('s004','琴沁',20,'女');  
insert into STUDENT values ('s005','王麗',20,'女');  
insert into STUDENT values ('s006','李波',21,'男');  
insert into STUDENT values ('s007','劉玉',21,'男');  
insert into STUDENT values ('s008','蕭蓉',21,'女');  
insert into STUDENT values ('s009','陳蕭曉',23,'女');  
insert into STUDENT values ('s010','陳美',22,'女');

初始化教師表

insert into TEACHER values ('t001', '劉陽');  
insert into TEACHER values ('t002', '諶燕');  
insert into TEACHER values ('t003', '胡明星');

初始化課程表

insert into COURSE values ('c001','J2SE','t002');  
insert into COURSE values ('c002','Java Web','t002');  
insert into COURSE values ('c003','SSH','t001');  
insert into COURSE values ('c004','Oracle','t001');  
insert into COURSE values ('c005','SQL SERVER 2005','t003');  
insert into COURSE values ('c006','C#','t003');  
insert into COURSE values ('c007','JavaScript','t002');  
insert into COURSE values ('c008','DIV+CSS','t001');  
insert into COURSE values ('c009','PHP','t003');  
insert into COURSE values ('c010','EJB3.0','t002');

初始化成績表

insert into SC values ('s001','c001',78.9);  
insert into SC values ('s002','c001',80.9);  
insert into SC values ('s003','c001',81.9);  
insert into SC values ('s004','c001',60.9);  
insert into SC values ('s001','c002',82.9);  
insert into SC values ('s002','c002',72.9);  
insert into SC values ('s003','c002',81.9);  
insert into SC values ('s001','c003',59);

執行後生成如下三張表

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='c001'
  ) a,
  (SELECT sno,score FROM SC WHERE cno='c002'
  ) 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 s2.sno,
  s1.name,
  COUNT(*),
  SUM(score)
FROM STUDENT s1,
  SC s2
WHERE s1.sno = s2.sno
GROUP BY s2.sno,s1.name;

4、查詢姓“劉”的老師的個數；

select count(distinct(name))
  from TEACHER
  where name like '劉%';

5、查詢沒學過“劉陽”老師課的同學的學號、姓名；

SELECT sno,
  name
FROM STUDENT 
WHERE sno NOT IN
  (SELECT DISTINCT( SC.sno)
  FROM SC sc,
    COURSE c,
    TEACHER t
  WHERE sc.cno=c.cno
  AND t.tno   =c.tno
  AND t.name  ='劉陽'
  );

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.S#,Student.Sname fromStudent,SC where Student.S#=SC.S# andSC.C#='001'and exists( Select * from SC as SC_2 whereSC_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# andTeacher.T#=Course.T# and Teacher.Tname='葉平'group by S#having count(SC.C#)=(select count(C#) fromCourse,Teacher whereTeacher.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# andC#='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；

SELECT sno,
  name
FROM Student
WHERE sno NOT IN
  (SELECT sc.sno FROM SC sc WHERE score>60
  );

---或者
SELECT sno,
  name
FROM Student
WHERE sno  IN
  (SELECT s.sno FROM STUDENT s left join sc on s.sno=sc.sno  group by s.sno having nvl(max(score),0)<60
  );

10、查詢沒有學全所有課的同學的學號、姓名；

SELECT sno,
  name
FROM STUDENT
WHERE sno IN
  (SELECT sno
  FROM SC
  GROUP BY sno
  HAVING COUNT(cno)<
    (SELECT COUNT(*) FROM COURSE
    )
  )

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

SELECT s.sno,
  s.name
FROM STUDENT S,
  SC sc
WHERE s.sno =sc.sno
AND sc.cno IN
  (SELECT cno FROM SC WHERE sno='1001'
  );

13、把“SC”表中“葉平”老師教的課的成績都更改爲此課程的平均成績；

 update SC set score=(select avg(SC_2.score)
 from SC SC_2
 where 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 FROM SC WHERE cno IN
( SELECT cno FROM SC sc JOIN COURSE c ON sc.cno=c.cno WHERE c.name='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# notin (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 t

GROUP 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 R

WHERE L.C# = R.C# and

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

FROM SC ASIL,Student AS IM

WHERE L.C# =IL.C# and IM.S#=IL.S#

GROUP BYIL.C#)

AND

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

FROM SC ASIR

WHERE 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,Course

where 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 Z

    where 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 3

      SC.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 T1

                      ON SC.S# = T1.S# AND T1.C# = '001'

            LEFT JOIN SC AS T2

                      ON SC.S# = T2.S# AND T2.C# = '002'

            LEFT JOIN SC AS T3

                      ON SC.S# = T3.S# AND T3.C# = '003'

            LEFT JOIN SC AS T4

                      ON SC.S# = T4.S# AND T4.C# = '004'

      WHERE student.S#=SC.S# 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.S# = T1.S# AND T1.C# = 'k1'

            LEFT JOIN sc AS T2

                      ON sc.S# = T2.S# AND T2.C# = 'k2'

            LEFT JOIN sc AS T3

                      ON sc.S# = T3.S# AND T3.C# = 'k3'

            LEFT JOIN sc AS T4

                      ON 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,Course

    where 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 SC

                  GROUP BY S#

                  ) AS T1

            WHERE 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 SC

        GROUP BY S#

        ) 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.S# as 學生ID,t1.C# as 課程ID,Score as 分數

      FROM SC t1

      WHERE score IN (SELECT TOP 3 score

              FROM SC

              WHERE 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 cno,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 sno,
  name
FROM student
WHERE sno IN
  ( SELECT sno FROM SC sc GROUP BY sc.sno HAVING COUNT(cno)=1
  );

30、查詢同名同性學生名單，並統計同名人數

<span style="font-weight: normal;">select name,count(*) from Student group by name having  count(*)>1;</span>

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 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

<span style="font-weight: normal;"><span style="font-size:10px;">SELECT s.sno,
  s.name,
  score
FROM STUDENT s,
  (SELECT sc.sno,
    AVG(score) score
  FROM Student s,
    SC sc
  WHERE s.sno=sc.sno
  GROUP BY sc.sno
  ) ss
WHERE s.sno=ss.sno;</span></span>

35、查詢所有學生的選課情況；

SELECT sc.sno,
  sc.cno,
  s.sname,
  c.name
FROM SC sc,
  Student s,
  Course c
WHERE sc.sno=s.sno
AND sc.cno  =c.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  distinct student.S#,student.Sname,SC.C#,SC.score 
    FROM student,Sc 
    WHERE SC.score>=70 AND SC.S#=student.S#;

37、查詢不及格的課程，並按課程號從大到小排列

select * from sc where score <60 order by cno ;

38、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；

<span style="font-weight: normal;">SELECT sc.sno,
  s.name
FROM SC sc,
  STUDENT t
WHERE sc.sno=s.sno
AND score   >80
AND sc.sno  ='003';</span>

39、求選了課程的學生人數

select count(distinct sc.sno) 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,Course C,Teacher

    where 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 t1

      WHERE score IN (SELECT TOP 2 score

              FROM SC

              WHERE 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  sc

    group  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  sc

    group  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#,Cname

    from  Course

    where  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='002'and cno='001';

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