SQL那个⾯试题(学⽣表_课程表_成绩表_教师表)
1. 查询“001”课程⽐“002”课程成绩⾼的所有学⽣的学号;
2. 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;
3. 查询平均成绩⼤于60分的同学的学号和平均成绩;
4. 查询所有同学的学号、姓名、选课数、总成绩;
5. 查询姓“李”的⽼师的个数;
6. 查询没学过“叶平”⽼师课的同学的学号、姓名;
7. 查询学过“001”并且也学过编号“002”课程的同学的学号、姓名;
8. 查询学过“叶平”⽼师所教的所有课的同学的学号、姓名;
9. 查询所有课程成绩⼩于60分的同学的学号、姓名;
10. 查询没有学全所有课的同学的学号、姓名;
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;
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;
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
sql容易学吗where SC_2.C#=SC.C# ) from Course,Teacher where Course.C#=SC.C# and Course.T#=Teacher.T# 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;
15. 删除学习“叶平”⽼师课的SC表记录;
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、2、号课的平均成绩;
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
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
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
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)
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.T#) AS 教师ID,MAX(Z.Tname) AS 教师姓名,C.C# 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.C#=C.C# and C.T#=Z.T#
GROUP BY C.C#
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 top3
SC.S# 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.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
TOP15WITH 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. 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.C# as 课程ID, Cname as 课程名称
,SUM(CASE WHEN score BETWEEN85AND100THEN1ELSE0END)AS[100-85]
,SUM(CASE WHEN score BETWEEN70AND85THEN1ELSE0END)AS[85-70]
,SUM(CASE WHEN score BETWEEN60AND70THEN1ELSE0END)AS[70-60]
,SUM(CASE WHEN score <60THEN1ELSE0END)AS[60-]
FROM SC,Course
where SC.C#=Course.C#
GROUP BY SC.C#,Cname;
24. 查询学⽣平均成绩及其名次
SELECT1+(SELECT COUNT(distinct平均成绩)
FROM(SELECT S#,AVG(score) AS 平均成绩
FROM SC
GROUP BY S#
)AS T1
WHERE平均成绩> T2.平均成绩)as名次,
S# as 学⽣学号,平均成绩
FROM(SELECT S#,AVG(score) 平均成绩
FROM SC
GROUP BY S#
)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.S# as 学⽣ID,t1.C# as 课程ID,Score as 分数
FROM SC t1
WHERE score IN(SELECT TOP3 score
FROM SC
WHERE t1.C#= C#
ORDER BY score DESC
)
ORDER BY t1.C#;
26. 查询每门课程被选修的学⽣数
select c#,count(S#) from sc group by C#;
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.S#,Student.Sname,count(C#) AS 选课数
from SC ,Student
where SC.S#=Student.S# group by SC.S# ,Student.Sname having count(C#)=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 C#,Avg(score) from SC group by C# order by Avg(score),C# 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.S# ,avg(score)
from Student,SC
where Student.S#=SC.S# group by SC.S#,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.S#=Student.S# and SC.C#=Course.C# and Course.Cname='数据库’and score <60;
35. 查询所有学⽣的选课情况
SELECT SC.S#,SC.C#,Sname,Cname
FROM SC,Student,Course
where SC.S#=Student.S# and SC.C#=Course.C# ;
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

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