create database lianx
create table student
(
sno char(3) not null primary key,
sname char(8) not null,
ssex char(2),
Sbirthday datetime,
Class varchar(5)
)
insert into student values(108,'曾华',1,'1977-09-01',95033)
insert into student values(105,'匡明',1,'1975-10-02',95031)
insert into student values(107,'王丽',0,'1976-01-23',95033)
insert into student values(101,'李军',1,'1976-02-20',95033)
insert into student values(109,'王芳',0,'1975-02-10',95031)
insert into student values(103,'陆君',1,'1974-06-03',95031)
select *from student
drop table student
create table course
(
cno char(5) not null primary key ,
cname varchar(10)not null,
tno char(3)not null references teacher(tno)
)
drop table course
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 char(3) not null references student(sno),
cno char(5) not null references course(cno),
degree decimal(4,1)
primary key(sno,cno)
)
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 char(3) not null primary key,
tname char(4) not null,
tsex char(2) not null,
tbirthday datetime,
prof char(6),
depart varchar(10) not null
)
insert into teacher values(804,'李诚',1,'1958-12-02','副教授','计算机系')
insert into teacher values(856,'张旭',1,'1969-03-12','讲师','电子工程系')
insert into teacher values(825,'王萍',0,'1972-05-05','助教','计算机系')
insert into teacher values(831,'刘冰',0,'1977-08-14','助教','电子工程系')
drop table teacher
drop table student
select *from teacher
select *from student select *from teacher select *from course select *from score
drop database lianxi
-- 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 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=85 or degree=86 or degree=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='0'
--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 sno,cno,degree from score where degree =(select max(degree) from score)
--11、 查询每门课的平均成绩。
select AVG(DEGREE) as 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 where cno in (select cno from score group by cno having COUNT(*)>=5) and cno like '3%'
select AVG(degree) 平均分 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 cno 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 left join score on student.sno = score .sno
--15、查询所有学生的Sno、Cname和Degree列。
select student.sno,cname,degree from student join score on student.sno = score.sno join course on score.cno = course.cno
--16、查询所有学生的Sname、Cname和Degree列
select sname,cname,degree from student join score 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) as 平均分 from score where degree in
(select degree from score join student on student.sno = score .sno where class='95033')
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')
--18、现查询所有同学的Sno、Cno和rank列。
select sno,cno,[rank] from score ,grade where degree between low and upp
--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 sno='109' and cno='3-105'
select *from student join score on student.sno = score .sno
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 sno from score group by sno having COUNT(*)>1
--select MAX(degree) from score group by cno
select *from score a where sno in (select sno from score group by sno having COUNT(*)>1)
and (degree not in (select MAX(degree)from score b where a.cno = b.cno group by cno ))
--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)=YEAR ((select sbirthday from student where sno='108'))
--23、查询“张旭“教师任课的学生成绩
select cno from course where course .tno=(select tno from teacher where tname = '张旭')
select degree from score where cno = (select cno from course where course .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 cno from score group by cno having COUNT(*)>5
--select tno from course where cno =(select cno from score group bu cno having COUNT(*)>5)
select tname from teacher
where tno =(select tno from course where cno =(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 student.sno,sname,ssex,sbirthday,class,course .cno,degree,cname,teacher.tno,tname,tsex,prof,depart from student
join score on student.sno=score .sno
join course on score .cno=course .cno
join teacher on course .tno=teacher .tno
where class ='95033' or class ='95031' order by student .sno
--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 tno from teacher where depart ='计算机系'
--select cno from course where tno in (select tno from teacher where depart ='计算机系')
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 *from teacher t1 where depart = '计算机系' and not exists
(
select *from teacher t2 where depart ='电子工程系' and t1.prof = t2.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 s1 where cno ='3-105' and sno in
(
select sno from score where cno ='3-245'
)
and degree >
(
select degree from score s2 where cno ='3-245' and sno in
(
select sno from score where cno ='3-105'
)
and s1.sno =s2.sno
)
--31、 查询所有教师和同学的name、sex和birthday.
select sname as name ,ssex as sex ,sbirthday as birthday 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 as name ,ssex as sex,sbirthday as birthday from student where ssex='0'
union
select tname ,tsex ,tbirthday from teacher where tsex = '0'
--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 in
(select cno from score group by cno))
--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 cno from course where cno not in (select cno from score)
select tname ,depart from teacher
where tno in (select tno from course where cno =(select cno from course where cno not in (select cno from score )))
select tname ,depart from teacher
--36、查询至少有2名男生的班号。
select class from student where ssex ='1' group by class having COUNT(ssex) >=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。
--(YEAR (DETDATE())-YEAR(sbirthday))
select sname,(YEAR(GETDATE())-YEAR(sbirthday)) 年龄 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
--41、查询“男”教师及其所上的课程。
--select tname from teacher where tsex='男'
--tsex ='男' and course .tno in (select tno from teacher where tsex='男')
select tname ,cname from teacher
join course on teacher .tno =course .tno
where tsex ='1' and course .tno in (select tno from teacher where tsex ='1')
--42、查询最高分同学的Sno、Cno和Degree列
select sno,cno,degree 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 =(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 where cno in (select cno from course where cname ='计算机导论')
and sno in (select sno from student where ssex = '1')