create database zuoye
use zuoye
create table student
(
sno varchar(20) not null,
sname varchar(20) not null,
ssex varchar(20) not null,
sbirthday datetime ,
class varchar(20) ,
)
insert into student values('108','曾华','男','1977-09-01','95033')
insert into student values('105','匡明','男','1975-10-02','95031')
insert into student values('107','王丽','女','1976-01-23','95033')
insert into student values('101','李军','男','1976-02-20','95033')
insert into student values('109','王芳','女','1975-02-10','95031')
insert into student values('103','陆君','男','1974-06-03','95031')
select *from student
create table course
(
cno varchar(20) not null,
cname varchar(20) not null,
tno varchar(20) not null,
)
insert into course values('3-105','计算机导论','825')
insert into course values('3-245','操作系统','804')
insert into course values('6-166','数字电路','856')
insert into course values('9-888','高等数学','831')
select *from course
create table score
(
sno varchar(20) not null,
cno varchar(20) not null,
degree decimal(4,1),
)
insert into score values('103','3-245',86)
insert into score values('105','3-245',75)
insert into score values('109','3-245',68)
insert into score values('103','3-105',92)
insert into score values('105','3-105',88)
insert into score values('109','3-105',76)
insert into score values('101','3-105',64)
insert into score values('107','3-105',91)
insert into score values('108','3-105',78)
insert into score values('101','6-166',85)
insert into score values('107','6-166',79)
insert into score values('108','6-166',81)
select *from score
create table teacher
(
tno varchar(20) not null,
tname varchar(20) not null,
tsex varchar(20) not null,
tbirthday datetime ,
prof varchar(20),
depart varchar(20) not null,
)
insert into teacher values('804','李诚','男','1958-12-02','副教授','计算机系')
insert into teacher values('856','张旭','男','1969-03-12','讲师','电子工程系')
insert into teacher values('825','王萍','女','1972-05-05','助教','计算机系')
insert into teacher values('831','刘冰','女','1977-08-14','助教','电子工程系')
select *from teacher
-- 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 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 DEGREE from score where degree>60 and degree<80
--5、 查询Score表中成绩为85，86或88的记录。
select DEGREE from score where degree=85 or degree=88 or degree=86
select DEGREE from score where degree in (85,88,86)
--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。（子查询或者排序）
select* from score where degree in (select MAX(degree)from score)
select top 1*from score order by degree desc
--11、 查询每门课的平均成绩。
select cno,avg(degree) 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 Cno,avg(degree) from Score where cno like '3%' group by Cno having count(*)>=5
--13、查询分数大于70，小于90的Sno列。
select sno from score where degree>70 and degree<90
-- 14、查询所有学生的Sname、Cno和Degree列。
select sname,cno,degree from student join score on student.sno =score.sno
--15、查询所有学生的Sno、Cname和Degree列
select sno,cname,degree from score join course on score.sno =score.sno
--16、查询所有学生的Sname、Cname和Degree列。
select cname,sname,degree from score join student on student.sno=score.sno join course on score.cno=course.cno
-- 17.查询“95033”班学生的平均分。
select avg(degree) from score where Sno in (select sno from student where class='95033')
--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 cno='3-105' and sno='109')
--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* from score where sno in (select sno from score group by sno having count(*)>1) and degree < (select max(degree) from score)
--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 cno='3-105' and degree>(select degree from score where cno='3-105' and sno='109')
--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) in (select YEAR(Sbirthday) from Student where Sno='108')
--23、查询“张旭“教师任课的学生成绩。
select Degree from Score where Cno in (select Cno from Course where Tno in (select Tno from Teacher where Tname='张旭'))
--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 Score group by Cno having COUNT(*)>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
--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。
--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
--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')
--31、 查询所有教师和同学的name、sex和birthday.
select Sname,Ssex,Sbirthday from Student
union
select tname,tsex,tbirthday from Teacher
--32、查询所有“女”教师和“女”同学的name、sex和birthday.
select Sname,Ssex,Sbirthday from Student where Ssex='女'
union
select tname,tsex,tbirthday from Teacher where Tsex='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 t1 left join (select avg(DEGREE) as 'avg' from score group by cno )t2 on t1.cno =t2.cno where t1.degree<t2.avg
--34、 查询所有任课教师的Tname和Depart.
Select tname,depart from teacher where tno in (select tno from course where cno in (select cno from score ))
--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 where cno in (select cno from score ))
--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 (*)>=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) as '年龄' from student -- datediff(year,sbirthday,getdate())
--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。
--41、查询“男”教师及其所上的课程。
select cname from course where tno in (select tno from teacher where tsex='男')
--42、查询最高分同学的Sno、Cno和Degree列。
select * from score where degree in (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 in (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 in (select Ssex from Student where Sname='李军')and class in (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 DEGREE from score where cno in (select cno from course where cname='计算机导论' and sno in (select sno from student where ssex='男'))