sl试题.docx

1、sl试题student(S#,Sname,Sage,Ssex) 学生表S#：学号；Sname：学生姓名；Sage：学生年龄；Ssex：学生性别Course(C#,Cname,T#) 课程表C#,课程编号；Cname：课程名字；T#：教师编号SC(S#,C#,score) 成绩表S#：学号；C#,课程编号；score：成绩Teacher(T#,Tname) 教师表T#：教师编号； Tname：教师名字问题：1、查询“001”课程比“002”课程成绩高的所有学生的学号；select a.S# from (select s#,score from SC where C#=001) a,(select

2、 s#,scorefrom SC where C#=002) bwhere a.scoreb.score and a.s#=b.s#;2、查询平均成绩大于60分的同学的学号和平均成绩；select S#,avg(score)from scgroup by S# having avg(score) 60;3、查询所有同学的学号、姓名、选课数、总成绩；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#

3、,Sname4、查询姓“李”的老师的个数；select count(distinct(Tname)from Teacherwhere Tname like 李%;5、查询没学过“叶平”老师课的同学的学号、姓名；select Student.S#,Student.Snamefrom Studentwhere S# not in (select distinct( SC.S#) from SC,Course,Teacher whereSC.C#=Course.C# and Teacher.T#=Course.T# and Teacher.Tname=叶平);6、查询学过“001”并且也学过编号“0

4、02”课程的同学的学号、姓名；select Student.S#,Student.Sname from Student,SC where Student.S#=SC.S# and SC.C#=001and exists( Select * from SC as SC_2 where SC_2.S#=SC.S# and SC_2.C#=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 S#,Snamefrom Studentwhere S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# an

5、d Teacher.T#=Course.T# and Teacher.Tname=叶平 group by S# having count(SC.C#)=(select count(C#) from Course,Teacherwhere Teacher.T#=Course.T# 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 S#,Sname from (select Student.S#,Student.Sname,score ,(select score from SC SC_2 where SC_2.S#=Stu

6、dent.S# and SC_2.C#=002) score2from Student,SC where Student.S#=SC.S# and C#=001) S_2 where score2 60);10、查询没有学全所有课的同学的学号、姓名；select Student.S#,Student.Snamefrom Student,SCwhere Student.S#=SC.S# group byStudent.S#,Student.Sname having count(C#) =60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数FROM SC T,Course

7、where t.C#=course.C#GROUP BY t.C#ORDER BY 100 * SUM(CASE WHENisnull(score,0)=60 THEN 1 ELSE 0 END)/COUNT(*) DESC20、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 C# =001 THEN score ELSE 0 END)/SUM(CASE C# WHEN 001 THEN 1 ELSE 0 END) AS 企业管理平均分,100 * SUM(CASE

8、WHEN C# = 001 AND score = 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = 001 THEN 1 ELSE 0 END) AS 企业管理及格百分数,SUM(CASE WHEN C# = 002 THEN score ELSE 0 END)/SUM(CASE C# WHEN 002 THEN 1 ELSE 0 END) AS 马克思平均分,100 * SUM(CASE WHEN C# = 002 AND score = 60 THEN 1 ELSE 0 END)/SUM(CASE WHEN C# = 002 THEN 1 ELSE 0 E

9、ND) AS 马克思及格百分数,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及格百分数,SUM(CASE WHEN C# = 004 THEN score ELSE 0 END)/SUM(CASE C# WHEN 004 THEN

10、 1 ELSE 0 END) AS 数据库平均分,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 数据库及格百分数FROM SC21、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,MAX(C.Cname) AS 课程名称,AVG(Score) AS 平均成绩FROM SC AS T,Course AS C ,Teache

11、r AS Zwhere T.C#=C.C# and C.T#=Z.T#GROUP BY C.C#ORDER BY AVG(Score) DESC22、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SELECTDISTINCT top 3SC.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

12、.score,0) + ISNULL(T2.score,0) + ISNULL(T3.score,0) + ISNULL(T4.score,0) as 总分FROM Student,SCLEFT JOIN SC AS T1ON SC.S# = T1.S# AND T1.C# = 001LEFT JOIN SC AS T2ON SC.S# = T2.S# AND T2.C# = 002LEFT JOIN SC AS T3ON SC.S# = T3.S# AND T3.C# = 003LEFT JOIN SC AS T4ON SC.S# = T4.S# AND T4.C# = 004WHERE s

13、tudent.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# = k1LEFT JOIN sc AS T2ON sc.S#

14、 = T2.S# AND T2.C# = k2LEFT JOIN sc AS T3ON sc.S# = T3.S# AND T3.C# = k3LEFT JOIN sc AS T4ON sc.S# = T4.S# AND T4.C# = k4ORDER 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, 60SELECT SC.C# as 课程ID, Cname as

15、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 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 SCG

16、ROUP BY S#) AS T2ORDER 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 t1WHERE score IN (SELECT TOP 3 scoreFROM SCWHERE 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

17、.S#,Student.Sname,count(C#) AS 选课数from SC ,Studentwhere 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 FRO

18、M 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 havingcount(*)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 agefrom studentwhereCONVERT(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

19、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,SCwhere Student.S#=SC.S# group by SC.S#,Sname havingavg(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,Coursewhere SC.S#=Student.S# and SC.C#=Course.C# andCourse.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,CnameFROM SC,Student,Coursewhere 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；SELECTdistinct student.S#,student.Sname,SC.C#,SC.scoreFROM student,ScWH