最全SQL笔试题

如下四个数据表Student(SID, Sname, Sage, Ssex) 学生表Course(CID, Cname, TID) 课程表SC(SID, CID, score) 成绩表Teacher(TID, Tname) 教师表注意课程从001开始问题：1、查询“001”课程比“002”课程成绩高的所有学生的学号select a.SID from (select Sid,score from

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7843人浏览 · 2022-02-28 15:51:18

Golden-Star · 2022-02-28 15:51:18 发布

如下四个数据表

Student(SID, Sname, Sage, Ssex) 学生表
Course(CID, Cname, TID) 课程表
SC(SID, CID, score) 成绩表
Teacher(TID, Tname) 教师表

注意课程从001开始

问题：

1、查询“001”课程比“002”课程成绩高的所有学生的学号

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、查询平均成绩大于60分的同学的学号和平均成绩

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

3、查询所有同学的学号、姓名、选课数、总成绩

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、查询姓“李”的老师的个数

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

5、查询没学过“叶平”老师课的同学的学号、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='叶平');

6、查询学过“001”并且也学过编号“002”课程的同学的学号、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、查询学过“叶平”老师所教的所有课的同学的学号、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='叶平' 
			group by SID having count(SC.CID)=(select count(CID) from Course,Teacher where Teacher.TID=Course.TID and Tname='叶平'));

8、查询课程编号“002”的成绩比课程编号“001”课程低的所有同学的学号、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、查询所有课程成绩小于60分的同学的学号、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、查询没有学全所有课的同学的学号、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、查询至少有一门课与学号为“1001”的同学所学相同的同学的学号和姓名

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

12、查询至少学过学号为“001”同学所有一门课的其他同学学号和姓名

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“叶平”老师教的课的成绩都更改为此课程的平均成绩

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='叶平');

14、查询和“1002”号的同学学习的课程完全相同的其他同学学号和姓名

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、删除学习“叶平”老师课的SC表记录

Delect SC from course ,Teacher 
    where Course.CID=SC.CID and Course.TID= Teacher.TID and Tname='叶平';

16、向SC表中插入一些记录，这些记录要求符合以下条件：没有上过编号“003”课程的同学学号、002号课的平均成绩

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、按平均成绩从高到低显示所有学生的“数据库”、“企业管理”、“英语”三门的课程成绩，按如下形式显示：学生ID,数据库,企业管理,英语,有效课程数,有效平均分

SELECT SID as 学生ID 
        ,(SELECT score FROM SC WHERE SC.SID=t.SID AND CID='004') AS 数据库 
        ,(SELECT score FROM SC WHERE SC.SID=t.SID AND CID='001') AS 企业管理 
        ,(SELECT score FROM SC WHERE SC.SID=t.SID AND CID='006') AS 英语 
        ,COUNT(*) AS 有效课程数, AVG(t.score) AS 平均成绩 
    FROM SC AS t 
    GROUP BY SID 
    ORDER BY avg(t.score)

18、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分

SELECT L.CID As 课程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、按各科平均成绩从低到高和及格率的百分数从高到低顺序

SELECT t.CID AS 课程号,max(course.Cname)AS 课程名,isnull(AVG(score),0) AS 平均成绩 
        ,100 * SUM(CASE WHEN isnull(score,0)>=60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数 
    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、查询如下课程平均成绩和及格率的百分数(用"1行"显示): 企业管理（001），马克思（002），OO&UML （003），数据库（004）

SELECT SUM(CASE WHEN CID ='001' THEN score ELSE 0 END)/SUM(CASE CID WHEN '001' THEN 1 ELSE 0 END) AS 企业管理平均分 
        ,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 企业管理及格百分数 
        ,SUM(CASE WHEN CID = '002' THEN score ELSE 0 END)/SUM(CASE CID WHEN '002' THEN 1 ELSE 0 END) AS 马克思平均分 
        ,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 马克思及格百分数 
        ,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及格百分数 
        ,SUM(CASE WHEN CID = '004' THEN score ELSE 0 END)/SUM(CASE CID WHEN '004' THEN 1 ELSE 0 END) AS 数据库平均分 
        ,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 数据库及格百分数 
	FROM SC

21、查询不同老师所教不同课程平均分从高到低显示

SELECT max(Z.TID) AS 教师ID,MAX(Z.Tname) AS 教师姓名,C.CID AS 课程ＩＤ,MAX(C.Cname) AS 课程名称,AVG(Score) AS 平均成绩 
		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、查询如下课程成绩第 3 名到第 6 名的学生成绩单：企业管理（001），马克思（002），UML （003），数据库（004） [学生ID],[学生姓名],企业管理,马克思,UML,数据库,平均成绩

SELECT DISTINCT top 3 
      SC.SID As 学生学号, 
        Student.Sname AS 学生姓名 , 
      T1.score AS 企业管理, 
      T2.score AS 马克思, 
      T3.score AS UML, 
      T4.score AS 数据库, 
      ISNULL(T1.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 总分 
      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、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]

SELECT SC.CID as 课程ID, Cname as 课程名称 
        ,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、查询学生平均成绩及其名次

SELECT 1+(SELECT COUNT( distinct 平均成绩) 
              FROM (SELECT SID,AVG(score) AS 平均成绩 
                      FROM SC 
                  GROUP BY SID 
                  ) AS T1 
            WHERE 平均成绩> T2.平均成绩) as 名次, 
      SID as 学生学号,平均成绩 
    FROM (SELECT SID,AVG(score) 平均成绩 
            FROM SC 
        GROUP BY SID 
        ) AS T2 
    ORDER BY 平均成绩desc;

25、查询各科成绩前三名的记录:(不考虑成绩并列情况)

SELECT t1.SID as 学生ID,t1.CID as 课程ID,Score as 分数 
      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、查询每门课程被选修的学生数

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

27、查询出只选修了一门课程的全部学生的学号和姓名

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

28、查询男生、女生人数

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

29、查询姓“张”的学生名单

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

30、查询同名同性学生名单，并统计同名人数

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

31、1981年出生的学生名单(注：Student表中Sage列的类型是datetime)

select Sname, CONVERT(char (11),DATEPART(year,Sage)) as age 
    from student 
    where CONVERT(char(11),DATEPART(year,Sage))='1981';

32、查询每门课程的平均成绩，结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列

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

33、查询平均成绩大于85的所有学生的学号、姓名和平均成绩

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

34、查询课程名称为“数据库”，且分数低于60的学生姓名和分数

Select Sname,isnull(score,0) 
    from Student,SC,Course 
    where SC.SID=Student.SID and SC.CID=Course.CID and Course.Cname='数据库'and score <60;

35、查询所有学生的选课情况；

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

36、查询任何一门课程成绩在70分以上的姓名、课程名称和分数；

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

37、查询不及格的课程，并按课程号从大到小排列

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

38、查询课程编号为003且课程成绩在80分以上的学生的学号和姓名

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

39、求选了课程的学生人数

select count(*) from sc;

40、查询选修“叶平”老师所授课程的学生中，成绩最高的学生姓名及其成绩

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='叶平' and SC.score=(select max(score)from SC where CID=C.CID );

41、查询各个课程及相应的选修人数

select count(*) from sc group by CID;

42、查询不同课程成绩相同的学生的学号、课程号、学生成绩

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

43、查询每门功成绩最好的前两名

SELECT t1.SID as 学生ID,t1.CID as 课程ID,Score as 分数 
      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、统计每门课程的学生选修人数（超过10人的课程才统计）。要求输出课程号和选修人数，查询结果按人数降序排列，查询结果按人数降序排列，若人数相同，按课程号升序排列

select CID as 课程号,count(*) as 人数 
    from sc 
    group by CID 
    order by count(*) desc,Cid

45、检索至少选修两门课程的学生学号

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

46、查询全部学生都选修的课程的课程号和课程名

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

47、查询没学过“叶平”老师讲授的任一门课程的学生姓名

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='叶平');

48、查询两门以上不及格课程的同学的学号及其平均成绩

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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