create database mydb3
go
use mydb3
create table student
(
--学号
sno varchar(3) not null primary key,
--姓名
sname varchar(4) not null,
--性别
ssex varchar(2) not null,
--出生年月
sbirthday datetime,
--所在班级
class varchar(5)
)
create table teacher
(
--教工编号
tno varchar(3) not null primary key,
--教工姓名
tname varchar(4) not null,
--教工性别
tsex varchar(2) not null,
--教工出生日期
tbirthday datetime,
--职称
prof varchar(6),
--所在部门
depart varchar(10)
)
create table course
(
--课程号
cno varchar(5) not null primary key,
--课程名称
cname varchar(10) not null,
--教工编号
tno varchar(3) references teacher(tno)
)
create table score
(
--学号
sno varchar(3) not null references student(sno),
--课程号
cno varchar(5) not null references course(cno),
--成绩
degree decimal(4,1)
)
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')
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','1958-08-14','助教','电子工程系')
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')
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 student
select * from teacher
select * from course
select * from score
--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 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(*) '人数' from student
where class='95031'
--10、查询Score表中的最高分的学生学号和课程号。
select sno,cno from score
where degree=
(
select MAX(degree) from score
)
--11、查询‘3-105’号课程的平均分。
select AVG(degree) from score
where cno='3-105'
--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=
(
select cno from score
where cno like '3%'
group by cno
having COUNT(*)>5
)
--13、查询最低分大于70，最高分小于90的Sno列。
select sno from score
group by sno
having MIN(degree)>70 and MAX(degree)<90
--14、查询所有学生的Sname、Cno和Degree列。
select student.sname,score.cno,score.DEGREE from score
join student on student.sno=score.sno
--15、查询所有学生的Sno、Cname和Degree列。
select score.sno,course.cname,score.DEGREE from score
join course on course.cno=score.cno
--16、查询所有学生的Sname、Cname和Degree列。
select student.sname,course.cname,score.DEGREE from score
join student on student.sno=score.sno
join course on course.cno=score.cno
--17、查询'95033'班所选课程的平均分。
select AVG(degree) from score
where sno in
(
select sno from student
where class='95033'
)
group by cno
--18、假设使用如下命令建立了一个grade表：
create table grade(low int,upp int,rank varchar(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。
select distinct sno,cno,RANK from score
join grade on score.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 * from student
where sno in
(
select sno 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 cno not in
(
select cno from score
where degree=
(
select MAX(degree) from score
)
)
and cno in
(
select cno from score
group by cno
having COUNT(cno)>1
)
--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)=
(
select YEAR(sbirthday) from student
where sno=108
)
--23、查询'张旭'教师任课的学生成绩。
select score.* from score
join course on score.cno=course.cno
join teacher on course.tno=teacher.tno
where tname='张旭'
select score.* from score,course,teacher
where score.cno=course.cno
and course.tno=teacher.tno
and 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 distinct tname from teacher
join course on course.tno=teacher.tno
join score on score.cno=course.cno
where score.cno=
(
select cno from score
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 in (95033,95031)
--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 distinct score.* from score
join course on course.cno=score.cno
join teacher on teacher.tno=course.tno
where teacher.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
)
union
select * from teacher t1 where depart='电子工程系' and not exists
(
select * from teacher t2 where depart = '计算机系' 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 * from score where cno = '3-105'and degree >
(
select MAX (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 * from score s1 where sno in
(
select sno from score where cno in ('3-105','3-245') group by sno having COUNT(*) > 1
) and cno = '3-105' and degree >
(
select degree from score s2 where sno in
(
select sno from score where cno in ('3-105','3-245') group by sno having COUNT(*) > 1
) and cno = '3-245' and s1.sno = s2.sno
)
--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。
--求每门课的平均分
--求低于平均分的成绩
select * from score s1 where degree <
(
select cno,AVG(degree) from score s2 where s1.cno = s2.cno group by cno
)
--34、查询所有任课教师的Tname和Depart.
select distinct tname,depart from teacher
--35 查询所有未讲课的教师的Tname和Depart.
select tname ,depart from teacher
left join course on teacher .tno =course .tno
left join score on course .cno = score.cno
where score .sno is null
select tname,depart from teacher where tno in
(
select * from course where cno not in
(
select distinct 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(*)>1
--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 asc
--41、查询'男'教师及其所上的课程。
select course.* from teacher
join course on teacher.tno=course.tno
where tsex='男'
--42、查询最高分同学的Sno、Cno和Degree列。
select * from score
where degree=
(
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 student.* from score
join course on course.cno=score.cno
join student on student.sno=score.sno
where course.cname='计算机导论' and ssex='男'
--46、查询score表中分数最高的学生的信息。
select * from student
where sno=
(
select sno from score
where degree=
(
select MAX(degree) from score
)
)
--47、查询score表中的平均分在80分以上的学生信息。
select * from score
select * from student
select * from student where sno in
(
select sno from score group by sno having AVG (degree )>80
)
