create database kaoshi2
go
use kaoshi2
go
--创建学生表格
create table student
(
sno char(3) primary key not null,
sname char(8) not null,
ssex char(2) not null,
sbirthday datetime,
class char(5)
)
--创建课程表
create table course
(
cno char(5) primary key not null,
cname varchar(10) not null,
tno char(3) not null
)
--创建成绩表
create table score
(
sno char(3) not null,
cno char(5) not null,
degree decimal(4,1)
)
--创建教师表
create table teacher
(
tno char(3) primary key not null,
tname char(4) not null,
tsex char(2) not null,
tbirthday datetime ,
prof char(6),
depart varchar(10) not null
)
--插入学生内容
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')
--插入教师表内容
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')
--插入课程表内容
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')
--插入成绩表数据
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 course
select * from score
select * from student
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 * 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 * from score where degree=85 or degree=86 or degree=88
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,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 top 1 sno,cno from score order by degree desc
--11、 查询每门课的平均成绩。
select AVG(degree) as 计算机导论平均分 from score where cno='3-105'
select AVG(degree) as 操作系统平均分 from score where cno='3-245'
select AVG(degree) as 数字电路平均分 from score where cno='6-166'
--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) as 平均分 from score where cno=
( select cno 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 student.sname,score.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 ,
(select cname from course where course.cno=score.cno) as cname,degree
from score
--16、查询所有学生的Sname、Cname和Degree列。
select (select sname from student where student.sno=score.sno) as sname,
(select cname from course where course.cno=score.cno) as cname,degree
from score
--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')
--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')
select * from grade
--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 student where sno in
(select sno from score where cno='3-105' and degree>
(select degree from score where sno='109' and cno='3-105')
)
--20、查询score中选学多门课程的同学中分数为非最高分成绩的记录。
select top 1* from score where sno in
(select sno from score group by sno having COUNT(*)>1 ) order by degree desc
select * from score where sno in
(select sno from score group by sno having COUNT(*)>1 )and sno!='103' order by degree desc
-- 错误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 student where sno in
(select sno 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。
declare @year int
select @year=datepart(year,sbirthday) from student where sno='108'
select @year
select sno, sname ,sbirthday from student where datepart(year,sbirthday)=@year
--23、查询“张旭“教师任课的学生成绩。
select degree from score where sno in
(select sno from student where cno=
(select cno from course where tno=
(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=
( select tno from course where cno=
(select top 1 cno from score group by cno having COUNT(*)>5))
-- 错误25、查询95033班和95031班全体学生的记录。
select * from student,score where class in('95033','95031') and student.sno=score.sno
-- 错误26、 查询存在有85分以上成绩的课程Cno.
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 * 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 in
(select prof from teacher where depart='计算机系' or depart='电子工程系' group by prof having COUNT(*)=1)
--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。
declare @xiao decimal(18,2)
select @xiao=MAX(degree) from score where cno='3-245'
select cno,sno,DEGREE from score where cno='3-105'and degree>=@xiao 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.
declare @xiao1 decimal(18,2)
select @xiao1=MAX(degree) from score where cno='3-245'
select cno,sno,DEGREE from score where cno='3-105'and degree>=@xiao1
--31、 查询所有教师和同学的name、sex和birthday.
select tname,tsex,tbirthday from teacher
union
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'
union
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 * from score where degree<
(select AVG(degree) from score where cno='3-105') and cno='3-105'
select * from score where degree<
(select AVG(degree) from score where cno='3-245') and cno='3-245'
select * from score where degree<
(select AVG(degree) from score where cno='6-166') and cno='6-166'
--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 ,DATEDIFF(year,sbirthday,'2016-6-15') from student
-- 错误 39、查询Student表中最大和最小的Sbirthday日期值。
select MAX(DATEpart(day,sbirthday)) from student
select Min(DATEpart(day,sbirthday)) from student
select MAX(sbirthday) ,MIN(sbirthday) from student
-- 错误 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 class ,DATEDIFF(year,sbirthday,getdate()) from student order by DATEDIFF(year,sbirthday,getdate()) desc
--41、查询“男”教师及其所上的课程。
select (select tname from teacher where teacher.tno=course.tno),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 sno=(select top 1 sno from score order by degree desc )
--43、查询和“李军”同性别的所有同学的Sname.
declare @lijunx char(10)
select @lijunx=ssex from student where sname='李军'
select sname from student where ssex=@lijunx and sname!='李军'
--44、查询和“李军”同性别并同班的同学Sname.
declare @lijun char(10),@lijun1 char(10)
select @lijun=ssex from student where sname='李军'
select @lijun1=class from student where sname='李军'
select sname from student where ssex=@lijun and class=@lijun1 and sname!='李军'
-- 45、查询所有选修“计算机导论”课程的并且是“男”同学的成绩表。
select * 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')
