1、 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.S#,Student.Sname from Student where S# not in (select distinct( SC.S#) from SC,Course,Teacher where SC.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“002”课程的同学的学号、姓名
2、; select Student.S#,Student.Sname from Student,SC where Student.S#=SC.S# and SC.C#=and exists( Select * from SC as SC_2 where SC_2.S#=SC.S# and SC_2.C#=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#,Sname from Student where S# in (select S# from SC ,Course ,Teacher where SC.C#=Course.C# and Teacher.T#=Cours
3、e.T# and Teacher.Tname= group by S# having count(SC.C#)=(select count(C#) from Course,Teacher where Teacher.T#=Course.T# and Tname=);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#=Student.S# and SC_2.C#=
4、) score2 from Student,SC where Student.S#=SC.S# and C#=) S_2 where score2 60);10、查询没有学全所有课的同学的学号、姓名; from Student,SC where Student.S#=SC.S# group by Student.S#,Student.Sname having count(C#) =60 THEN 1 ELSE 0 END)/COUNT(*) AS 及格百分数 FROM SC T,Course where t.C#=course.C# GROUP BY t.C# ORDER BY 100 * S
5、UM(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 C# = THEN score ELSE 0 END)/SUM(CASE C# WHEN THEN 1 ELSE 0 END) AS 企业管理平均分 ,100 * SUM(CASE WHEN C# = AND score = 60 THEN 1 ELSE 0 END)/SUM(CASE
6、 WHEN C# = THEN 1 ELSE 0 END) AS 企业管理及格百分数 ,SUM(CASE WHEN C# = THEN 1 ELSE 0 END) AS 马克思平均分 THEN 1 ELSE 0 END) AS 马克思及格百分数 003 THEN 1 ELSE 0 END) AS UML平均分 THEN 1 ELSE 0 END) AS UML及格百分数 THEN 1 ELSE 0 END) AS 数据库平均分 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.T#) AS
7、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 ,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
8、top 3 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# = LEFT JOIN SC AS T2 ON SC.S# = T2.S
9、# AND T2.C# = LEFT JOIN SC AS T3 ON SC.S# = T3.S# AND T3.C# = LEFT JOIN SC AS T4 ON SC.S# = T4.S# AND T4.C# = 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)
10、+ 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,
11、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 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
12、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 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 TOP 3 scor
13、e 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 c
14、ount(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:Studen
15、t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)=198132、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
16、.S# ,avg(score) 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 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; SELECT
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