student表

course表

score表

teacher表

1、 查詢Student表中的所有記錄的Sname、Ssex和Class列。

select Sname,Ssex,Class from Student;

2、 查詢教師所有的單位即不重復的Depart列。

select distinct Depart from Teacher

3、 查詢Student表的所有記錄。

select * from Student

4、 查詢Score表中成績在60到80之間的所有記錄。

select *from Score where Degree between 60 and 80;

5、 查詢Score表中成績?yōu)?5，86或88的記錄。

select *from Score where Degree in(85,86,88);

6、 查詢Student表中“95031”班或性別為“女”的同學記錄。

select *from Student where Class=95031 or Ssex='女';

7、 以Class降序查詢Student表的所有記錄。

select *from Student order by Class desc;

8、 以Cno升序、Degree降序查詢Score表的所有記錄。

select * from Score order by Cno,Degree desc;

9、 查詢“95031”班的學生人數(shù)。

select COUNT(*) from Student where Class=95031;

10、 查詢Score表中的最高分的學生學號和課程號。

select Sno,Cno from Score where Degree=(select MAX(Degree) from Score);

11、 查詢每門課的平均成績。

SELECT cno,AVG(degree) FROM score GROUP BY cno;

12、 查詢Score表中至少有5名學生選修的并以3開頭的課程的平均分數(shù)。

SELECT cno,AVG(degree) FROM score GROUP BY cno HAVING COUNT(cno) > 5 AND

cno LIKE '3%';

13、 查詢分數(shù)大于70，小于90的Sno列。

select Sno from Score where Degree >70 and Degree <90--分數(shù)大于70，小于90的Sno列

14、 查詢所有學生的Sname、Cno和Degree列。

select Sname, Cno, Degree from Student,Score where Student.Sno = Score.Sno;

15、 查詢所有學生的Sno、Cname和Degree列。

select Score.Sno,course.Cname, course.Degree from Score join course on course.cno = score.cno;

16、 查詢所有學生的Sname、Cname和Degree列。

select Sname,Cname,Degree from student join Score on Student.Sno=Score.Sno join Course on Score.Cno=Course.Cno

17、 查詢“95031”班學生的平均分。

select AVG(degree)from Student join Score on Student.Sno=Score.Sno and Class='95031'

18、 假設使用如下命令建立了一個grade表

現(xiàn)查詢所有同學的Sno、Cno和rank列。

create table grade(low int(3),upp int(3),rank char(1))

insert into grade values(90,100,’A’)

insert into grade values(80,89,’B’)

insert into grade values(70,79,’C’)

insert into grade values(60,69,’D’)

insert into grade values(0,59,’E’)

19、查詢選修“3-105”課程的成績高于“109”號同學成績的所有同學的記錄。

select*from Score where Cno='3-105'and degree>(select degree from score where Sno='109' and Cno='3-105')

20、查詢和學號為108、101的同學同年出生的所有學生的Sno、Sname和Sbirthday列。

select sno ,sname,sbirthday from student where

year(sbirthday) = (select year(sbirthday) from student where sno = 101) or

year(sbirthday) = (select year(sbirthday) from student where sno = 108);

21、查詢“張旭“教師任課的學生成績。

select degree from Score where Cno in (select Cno from Course

where Tno in (select Tno from Teacher where Tname = '張旭'))

select degree from Score join Course on Score.Cno=Course.Cno join Teacher on Course.Tno=Teacher.Tno

where Tname = '張旭'

22、查詢選修某課程的同學人數(shù)多于5人的教師姓名。

select Tname from Teacher

where Tno=(select Tno from Course where Cno=(select Cno from Score group by Cno having COUNT(Cno)>=5))

23、查詢95033班和95031班全體學生的記錄。

select*from student inner join Score on Student.Sno=Score.Sno where Class in(95033,95031)

select *from Student,Score where Class in(95033,95031) and Student.Sno=Score.Sno

24、 查詢存在有85分以上成績的課程Cno.

select distinct Cno from Score where degree>=85;--去重

25、查詢出“計算機系“教師所教課程的成績表。

select *from Score where Cno in( select Cno from Course

where Tno in (select Tno from Teacher where Depart='計算機系'))

select Sno,Score.Cno,Degree from Score

join Course on Score.Cno=Course.Cno join Teacher on Course.Tno=Teacher.Tno where Depart='計算機系'

26、查詢“計算 機系”與“電子工程系“不同職稱的教師的Tname和Prof。

select Tname,Prof from Teacher where Prof not in

(select prof from Teacher where Depart='電子工程系' and Prof in (select Prof from Teacher where Depart='計算機系'))

and Depart in ('計算機系','電子工程系')

--查詢兩個系中教師相同職稱名稱，不在這里面的就是除去兩個系都有的剩下的，見上面

select prof from Teacher where Depart='電子工程系' and Prof in (select Prof from Teacher where Depart='計算機系')

27、查詢選修編號為“3-105“課程且成績至少高于選修編號為“3-245”的同學的Cno、Sno和Degree,并按Degree從高到低次序排序。

select Cno,Sno,Degree from Score a where

(select Degree from Score b where Cno='3-105' and b.Sno=a.Sno)>=

(select Degree from Score c where Cno='3-245' and c.Sno=a.Sno) order by Degree desc

28、查詢選修編號為“3-105”且成績高于選修編號為“3-245”課程的同學的Cno、Sno和Degree.

select Cno,Sno,Degree from Score a where

(select Degree from Score b where Cno='3-105' and b.Sno=a.Sno)>(select Degree from Score c where Cno='3-245' and c.Sno=a.Sno)

29、 查詢所有教師和同學的name、sex和birthday.–表連接，union(縱向連接，表1和表2數(shù)據(jù)類型要對應且列數(shù)對應)上下鏈接，與join on左右相關鏈接不同。

select distinct Sname as name,Ssex as sex,Sbirthday as birthday from student

union

select distinct Tname as name,Tsex as sex,Tbirthady as birthday from Teacher

30、查詢所有“女”教師和“女”同學的name、sex和birthday.

select distinct Sname as name,Ssex as sex,Sbirthday as birthday from student where Ssex='女'

union

select distinct Tname as name,Tsex as sex,Tbirthady as birthday from Teacher where Tsex='女'

31、查詢成績比該課程平均成績低的同學的成績表。–相關子查詢–同一門學科的平均分,每門學科低于自身平均分的。

select Sno,Cno,Degree from Score a where a.Degree

32、查詢所有任課教師的Tname和Depart.

select Tname,Depart from Teacher

where Tname in (select distinct Tname from Teacher,Course,Score where Teacher.Tno=Course.Tno and Course.Cno=Score.Cno)

select Tname,Depart from Teacher

where tno in (select tno from course where Cno in (select distinct Cno from Score))

33、查詢所有未講課的教師的Tname和Depart.

select Tname,Depart from Teacher

where Tname not in

(select distinct Tname from Teacher,Course,Score where Teacher.Tno=Course.Tno and Course.Cno=Score.Cno)

34、查詢至少有2名男生的班號。

select Class FROM student where Ssex='男' group by Class having COUNT(*)>1

35、查詢Student表中不姓“王”的同學記錄。

select * from student where Sname not like ('王%')

36、查詢Student表中每個學生的姓名和年齡。

select Sname,YEAR(GETDATE())-year(Sbirthday) from student

37、查詢Student表中最大和最小的Sbirthday日期值。

select MAX(Sbirthday) as 最大,MIN(Sbirthday) as 最小 from student

38、以班號和年齡從大到小的順序查詢Student表中的全部記錄。

select * from student order by Class desc,Sbirthday asc

39、查詢“男”教師及其所上的課程。

select Tname,Cname from Teacher,Course where Tsex='男' and Teacher.Tno=Course.Tno

40、查詢最高分同學的Sno、Cno和Degree列。

select Sno,Cno,Degree from Score where degree=(select MAX(Degree)from Score)

41、查詢和“李軍”同性別的所有同學的Sname.

select Sname from student where Ssex=(select Ssex from student where Sname='李軍') and Sname not in ('李軍')

42、查詢和“李軍”同性別并同班的同學Sname.

select Sname from student where

Ssex=(select Ssex from student where Sname='李軍')

and Sname not in ('李軍')

and Class=(select Class from student where Sname='李軍')

43、查詢所有選修“計算機導論”課程的“男”同學的成績表。

select Sno,Degree from Score

where Sno in (select Sno from student where Ssex='男') and Cno in (select Cno from Course where Cname='計算機導論')

總結

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