经典SQL练习题

题目地址：http://blog.csdn.net/qaz13177_58_/article/details/5575711

1、 查询Student表中的所有记录的Sname、Ssex和Class列。
select sname,ssex,class from STUDENT
2、 查询教师所有的单位即不重复的Depart列。
select depart from TEACHER group by depart
select distinct depart from teacher
3、 查询Student表的所有记录。
select * from student
4、 查询Score表中成绩在60到80之间的所有记录。
select * from score where degree between 60 and 80
5、 查询Score表中成绩为85，86或88的记录。
select * from score where degree in(85,86,88)
6、 查询Student表中“95031”班或性别为“女”的同学记录。
select * from student where class='95031' or ssex='女'
7、 以Class降序查询Student表的所有记录。
select * from student order by class desc
8、 以Cno升序、Degree降序查询Score表的所有记录。
select * from score order by cno asc,degree desc
9、 查询“95031”班的学生人数。
select count(*) from student where class='95031'
10、查询Score表中的最高分的学生学号和课程号。
select sno,cno from score where degree=(select max(degree) from score)
select sno,cno from score where degree=(select top 1 degree from score order by degree desc)
11、查询‘3-105’号课程的平均分。
select avg(degree) from score where cno='3-105'
12、查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。
select avg(degree) from score where cno like '3%' group by cno having count(sno)>=5
13、查询最低分大于70，最高分小于90的Sno列。
select sno from score group by sno having min(degree)>70 and max(degree)<90
14、查询所有学生的Sname、Cno和Degree列。
select s.SNAME,c.CNO,c.DEGREE from score c inner join student s on c.SNO=s.SNO
15、查询所有学生的Sno、Cname和Degree列。
select s.sno,c.cname,s.degree from score s inner join course c on s.CNO=c.CNO
16、查询所有学生的Sname、Cname和Degree列。
select st.SNAME,cu.CNAME,sc.DEGREE from student st inner join score sc on st.SNO=sc.SNO inner join course cu on sc.CNO=cu.CNO
17、查询“95033”班所选课程的平均分。
select avg(degree) from score where sno in(select sno from STUDENT where class='95033')
SELECT AVG(A.DEGREE) FROM SCORE A JOIN STUDENT B ON A.SNO = B.SNO WHERE B.CLASS='95033'
18、假设使用如下命令建立了一个grade表：
create table grade(low int,upp int,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');
现查询所有同学的Sno、Cno和rank列。
select sno,cno,(select rank from grade where degree between low and upp) from score
19、查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。
select * from score where cno='3-105' and degree>(select degree from score where sno='109' and cno='3-105')
20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录。
select * from score where sno in(select sno from score where degree<(select MAX(degree) from score) group by sno having COUNT(*)>1) order by degree desc
21、查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。
select * from score where degree>(select degree from score where sno='109' and cno='3-105')
22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。
select sno,sname,sbirthday from student where Year(sbirthday)=(select Year(sbirthday) from student where sno='108')
23、查询“张旭“教师任课的学生成绩。
select sno,degree from course c inner join teacher t on c.tno=t.tno inner join score s on s.cno=c.cno where tname='张旭'
select sno,degree from score where cno in(select cno from course where tno=(select tno from teacher where tname='张旭'))//感觉这里用in好一点，一个老师可能上多门课
24、查询选修某课程的同学人数多于5人的教师姓名。
select tname from teacher where tno=(select tno from course where cno in(select cno from score group by cno having count(cno)>5))
select t.tname from teacher t inner join course c on t.tno=c.tno left join score s on c.cno=s.cno group by t.tname having COUNT(*)>5
25、查询95033班和95031班全体学生的成绩记录。
select * from score where sno in(select sno from student where class in('95033','95031'))
26、查询存在有85分以上成绩的课程Cno.
select cno from score where degree>85 group by cno
select cno from score group by cno having max(degree)>85
27、查询出“计算机系“教师所教课程的成绩表。
select * from score where cno in(select cno from course where tno in(select tno from teacher where depart='计算机系'))
select * from score where cno in (select c.cno from course c join teacher t on c.tno=t.tno and t.depart='计算机系')
28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。
select tname,prof from teacher where depart='计算机系' and prof not in (select prof from teacher where depart='电子工程系');//网上答案，意思有点不对
select TName,Prof from TEACHER where DEPART='计算机系' and PROF not in (select PROF from TEACHER where DEPART='电子工程系') union select TName,Prof from TEACHER where DEPART='电子工程系' and PROF not in (select PROF from TEACHER where DEPART='计算机系')//应该相互职称不同
29、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。
select cno,sno,degree from score where cno='3-105' and degree>(select min(degree) from score where cno='3-245') order by degree desc
select cno,sno,degree from score where cno='3-105' and degree>any(select degree from score where cno='3-245') order by degree desc
30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree。
select cno,sno,degree from score where cno='3-105' and degree>(select max(degree) from score where cno='3-245') order by degree desc
select cno,sno,degree from score where cno='3-105' and degree>all(select degree from score where cno='3-245') order by degree desc
31、查询所有教师和同学的name、sex和birthday。
select tname as name,tsex as sex,tbirthday as birthday from teacher union select sname as name,ssex as sex,sbirthday as birthday from student
32、查询所有“女”教师和“女”同学的name、sex和birthday。
select tname as name,tsex as sex,tbirthday as birthday from teacher where tsex='女' union select sname as name,ssex as sex,sbirthday as birthday from student where ssex='女'
33、查询成绩比该课程平均成绩低的同学的成绩表。
select * from score s inner join (select avg(degree) as avgScore,cno from score group by cno) t on s.CNO=t.CNO where s.DEGREE<t.avgScore
34、查询所有任课教师的Tname和Depart。
select t.tname,t.depart from course c inner join teacher t on c.tno=t.tno
35 查询所有未讲课的教师的Tname和Depart.。
select tname,depart from course c right join teacher t on c.tno=t.tno where c.cno is null//course左连接就不会有null的值了，必须右连接
select tname,depart from teacher t left join course c on c.tno=t.tno where c.cno is null
36、查询至少有2名男生的班号。
select class from student where ssex='男' group by class having count(sno)>=2
37、查询Student表中不姓“王”的同学记录。
select * from student where sname not like '王%'
38、查询Student表中每个学生的姓名和年龄。
select sname,datediff(year,sbirthday,getdate()) from student
select sname,year(getdate())-year(sbirthday) from student
39、查询Student表中最大和最小的Sbirthday日期值。
select max(sbirthday),min(sbirthday) from student
40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
select * from student order by class desc,sbirthday asc//日期小年龄大
41、查询“男”教师及其所上的课程。
select * from course c inner join teacher t on c.tno=t.tno where tsex='男'
42、查询最高分同学的Sno、Cno和Degree列。
select * from score where degree=(select max(degree) from score)
43、查询和“李军”同性别的所有同学的Sname。
select sname from student where ssex=(select ssex from student where sname='李军')
44、查询和“李军”同性别并同班的同学Sname。
select sname from student where ssex=(select ssex from student where sname='李军') and class=(select class from student where sname='李军')
45、查询所有选修“计算机导论”课程的“男”同学的成绩表。
select * from score s inner join course c on s.cno=c.cno inner join student st on s.sno=st.sno where cname='计算机导论' and ssex='男'