use 晚homework
1、 查询Student表中的所有记录的Sname、Ssex和Class列。
select *from Student
select Sname ,Ssex, Class from Student
2、 查询教师所有的单位即不重复的Depart列。
select *from Teacher
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
select Class, Ssex 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。（子查询或者排序）
select *from Score
select Sno ,Cno from Score
where degree=(select MAX (degree) from Score )
11、 查询每门课的平均成绩。
select AVG (degree) ,cno from Score group by cno
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 group by Cno having Cno like '3%'and COUNT(sno)>=5
13、查询分数大于70，小于90的Sno列。
select sno from Score where Degree between 70 and 90
select sno from Score where degree between 70 and 90
14、查询所有学生的Sname、Cno和Degree列。
select sname,cno ,degree from Student
join Score on Score.Sno =Student .Sno
select sname ,cno,degree from Student
join Score on Score.Sno =Student .Sno
15、查询所有学生的Sno、Cname和Degree列。
select sno,cname,DEGREE from Score
join Course on Course.Cno=Score.cno
16、查询所有学生的Sname、Cname和Degree列。
select sname ,cname ,DEGREE from Student
join score on score.sno=student.sno
join Course on Course.Cno=Score.cno
17、?查询“95033”班学生的平均分。
select AVG (degree) from Score
join Student on Score .Sno=Student .Sno
where Class ='95033'
select AVG (degree) from Score
join student on Score.Sno=Student .Sno
where Class ='95033'
18、 假设使用如下命令建立了一个grade表：
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’)
现查询所有同学的Sno、Cno和rank列。
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 degree from Score where cno='3-105'and Degree>(select Degree from Score where Cno ='3-105' and Sno ='109')
select *from Score join Student on Student.Sno=Score .Sno
join Course on Course.Cno=Score.Cno
join teacher on teacher.tno=course.tno
where course.cno='3-105'and degree>( select degree from score where score.cno='3-105'and score.sno='109' )
select
--20、查询score中选学多门课程的同学中分数为非最高分成绩的记录。
select DEGREE from Score where Degree < (select max (Degree) from Score where COUNT (Cno )>2 order by )
--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
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 )=YEAR ((select sbirthday from Student where sno='108'))
23、查询“张旭“教师任课的学生成绩。
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 in
(select Tno from Course where cno in(select cno from Course group by cno having COUNT(Cno ) >5))
25、查询95033班和95031班全体学生的记录。
select *from Student where Class ='95033' or Class ='95031'
26、? 查询存在有85分以上成绩的课程Cno.
select distinct cno from Score where Degree >85
select cno from score where degree >85
27、查询出“计算机系“教师所教课程的成绩表。
select DEGREE from Score where Cno in(
select cno from Course where Tno in
(select tno from Teacher where 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 prof not in (select prof from teacher where depart='计算机系'
and Prof in(select Prof from Teacher where Depart ='电子工程系'))
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 >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>all(select DEGREE from Score where Cno ='3-245')
31、?查询所有教师和同学的name、sex和birthday.
select tname,tsex,tbirthday from Teacher
select sname,ssex,sbirthday from Student
32、查询所有“女”教师和“女”同学的name、sex和birthday.
select tname,tsex,tbirthday from Teacher where Tsex ='女'
select sname,ssex,sbirthday 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 DEGREE from Score where Degree < (select AVG(Degree ) from score )
34、 查询所有任课教师的Tname和Depart.
select tname,depart from Teacher
35?、 查询所有未讲课的教师的Tname和Depart.
select tname ,depart from Teacher where Tno not in (select Tno from Course )
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 ,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 desc
41、查询“男”教师及其所上的课程。
select tname ,(select cname from Course where Course .Tno =Teacher .Tno )from Teacher where tsex='男'
42、查询最高分同学的Sno、Cno和Degree列。
select sno,cno,DEGREE from Score where Degree > (select MAX (Degree ) from Score ) order by degree desc
43、查询和“李军”同性别的所有同学的Sname.
select sname from Student where Ssex=(select Ssex 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 where Sname ='李军') and class=(select class 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 degree from Score where Sno in (select Sno from Student where Ssex ='男')and Cno in(select Cno from Course where Cname ='计算机导论')