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‘,‘曾華‘,‘男‘,‘1977-09-01‘,‘95033‘)
insert into student values(‘105‘,‘匡明‘,‘男‘,‘1975-10-02‘,‘95031‘)
insert into student values(‘107‘,‘王麗‘,‘女‘,‘1976-01-23‘,‘95033‘)
insert into student values(‘101‘,‘李軍‘,‘男‘,‘1976-02-20‘,‘95033‘)
insert into student values(‘109‘,‘王芳‘,‘女‘,‘1975-02-10‘,‘95031‘)
insert into student values(‘103‘,‘陸君‘,‘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‘,‘計算機導論‘,‘825‘)
insert into course values(‘3-245‘,‘操作系統‘,‘804‘)
insert into course values(‘6-166‘,‘數字電路‘,‘856‘)
insert into course values(‘9-888‘,‘高等數學‘,‘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‘,‘李誠‘,‘男‘,‘1958-12-02‘,‘副教授‘,‘計算機系‘)
insert into teacher values(‘856‘,‘張旭‘,‘男‘,‘1969-03-12‘,‘講師‘,‘電子工程系‘)
insert into teacher values(‘825‘,‘王萍‘,‘女‘,‘1972-05-05‘,‘助教‘,‘計算機系‘)
insert into teacher values(‘831‘,‘劉冰‘,‘女‘,‘1977-08-14‘,‘助教‘,‘電子工程系‘)
select *from teacher

-- 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 DEGREE from score where degree>60 and degree<80
--5、 查詢Score表中成績為85，86或88的記錄。
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 asc,degree desc
--9 查詢“95031”班的學生人數。
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。（子查詢或者排序）
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名學生選修的並以3開頭的課程的平均分數。
select Cno,avg(degree) from Score where cno like ‘3%‘ group by Cno having count(*)>=5
--13、查詢分數大於70，小於90的Sno列。
select sno from score where degree>70 and degree<90
-- 14、查詢所有學生的Sname、Cno和Degree列。
select sname,cno,degree from student join score on student.sno =score.sno

--15、查詢所有學生的Sno、Cname和Degree列
select sno,cname,degree from score join course on score.sno =score.sno
--16、查詢所有學生的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.查詢“95033”班學生的平均分。
select avg(degree) from score where Sno in (select sno from student where class=‘95033‘)
--19、 查詢選修“3-105”課程的成績高於“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 cno=‘3-105‘ and sno=‘109‘)

--20、查詢score中選學多門課程的同學中分數為非最高分成績的記錄。
select* from score where sno in (select sno from score group by sno having count(*)>1) and degree < (select max(degree) from score)
--21 查詢成績高於學號為“109”、課程號為“3-105”的成績的所有記錄。
select*from score where cno=‘3-105‘ and degree>(select degree from score where cno=‘3-105‘ and sno=‘109‘)
--22、查詢和學號為108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) in (select YEAR(Sbirthday) from Student where Sno=‘108‘)
--23、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‘))

--24、查詢選修某課程的同學人數多於5人的教師姓名。

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、查詢95033班和95031班全體學生的記錄。

select * from Student where Class=‘95033‘ or class=‘95031‘

--26、 查詢存在有85分以上成績的課程Cno

select distinct cno from Score where Degree>85

--27、查詢出“計算機系“教師所教課程的成績表。

select Degree from Score where Cno in(select Cno from Course where Tno in(select tno from Teacher where Depart=‘計算機系‘))

--28、查詢“計算機系”與“電子工程系“不同職稱的教師的Tname和Prof。

--29、查詢選修編號為“3-105“課程且成績至少高於選修編號為“3-245”的同學的Cno、Sno和Degree,並按Degree從高到低次序排序。

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、查詢選修編號為“3-105”且成績高於選修編號為“3-245”課程的同學的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、 查詢所有教師和同學的name、sex和birthday.

select Sname,Ssex,Sbirthday from Student
union
select tname,tsex,tbirthday from Teacher

--32、查詢所有“女”教師和“女”同學的name、sex和birthday.

select Sname,Ssex,Sbirthday from Student where Ssex=‘女‘
union
select tname,tsex,tbirthday from Teacher where Tsex=‘女‘

--33、 查詢成績比該課程平均成績低的同學的成績表。
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、 查詢所有任課教師的Tname和Depart.
Select tname,depart from teacher where tno in (select tno from course where cno in (select cno from score ))
--35 、 查詢所有未講課的教師的Tname和Depart.
Select tname,depart from teacher where tno not in (select tno from course where cno in (select cno from score ))
--36、查詢至少有2名男生的班號。
select class from Student where Ssex=‘男‘ group by Class having COUNT (*)>=2
--37、查詢Student表中不姓“王”的同學記錄。
select*from student where sname not like ‘王%‘
--38、查詢Student表中每個學生的姓名和年齡。
select sname,YEAR(GETDATE())-YEAR(sbirthday) as ‘年齡‘ from student -- datediff(year,sbirthday,getdate())
--39、查詢Student表中最大和最小的Sbirthday日期值。
select max(sbirthday),MIN(sbirthday) from student
--40、以班號和年齡從大到小的順序查詢Student表中的全部記錄。
--41、查詢“男”教師及其所上的課程。
select cname from course where tno in (select tno from teacher where tsex=‘男‘)
--42、查詢最高分同學的Sno、Cno和Degree列。
select * from score where degree in (select MAX(degree) from score)
--43、查詢和“李軍”同性別的所有同學的Sname.
select sname from student where ssex in (select ssex from student where sname=‘李軍‘)
--44、查詢和“李軍”同性別並同班的同學Sname.
select sname from Student where Ssex in (select Ssex from Student where Sname=‘李軍‘)and class in (select Class from Student where Sname=‘李軍‘)
--45、查詢所有選修“計算機導論”課程的“男”同學的成績表。
select DEGREE from score where cno in (select cno from course where cname=‘計算機導論‘ and sno in (select sno from student where ssex=‘男‘))

數據庫練習總結