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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

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)、2、
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”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,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
,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,Course C,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;
49、檢索“004”課程分?jǐn)?shù)小于60，按分?jǐn)?shù)降序排列的同學(xué)學(xué)號(hào)
select Sid from SC where Cid='004'and score <60 order by score desc;
50、刪除“002”同學(xué)的“001”課程的成績(jī)

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频

SQL面試題(一)

SQL面試題(一)

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