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#建学生信息表student create table student ( sno varchar(20) not null primary key, sname varchar(20) not null, ssex varchar(20) not null, sbirthday datetime, class varchar(20) ); #建立教师表 create table teacher ( tno varchar(20) not null primary key, tname varchar(20) not null, tsex varchar(20) not null, tbirthday datetime, prof varchar(20), depart varchar(20) not null ); #建立课程表course create table course ( cno varchar(20) not null primary key, cname varchar(20) not null, tno varchar(20) not null, foreign key(tno) references teacher(tno) ); #建立成绩表 create table score ( sno varchar(20) not null primary key, foreign key(sno) references student(sno), cno varchar(20) not null, foreign key(cno) references course(cno), degree decimal ); #添加学生信息 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‘); #添加教师表 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‘); #添加课程表 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‘); #添加成绩表 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(‘103‘,‘3-105‘,‘64‘); insert into score values(‘105‘,‘3-105‘,‘91‘); insert into score values(‘109‘,‘3-105‘,‘78‘); insert into score values(‘103‘,‘6-166‘,‘85‘); insert into score values(‘105‘,‘6-166‘,‘79‘); insert into score values(‘109‘,‘6-166‘,‘81‘);
1、 查询Student表中的所有记录的Sname、Ssex和Class列。
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select Sname,Ssex,Class from student
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2、 查询教师所有的单位即不重复的Depart列。
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select distinct Depart from teacher
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3、 查询Student表的所有记录。
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select * from student
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4、 查询Score表中成绩在60到80之间的所有记录。
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select * from Score where Degree between 60 and 80
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5、 查询Score表中成绩为85,86或88的记录。
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select * from Score where Degree in (85,86,88)
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6、 查询Student表中“95031”班或性别为“女”的同学记录。
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select * from Student where class= ‘95031‘ or Ssex= ‘女‘
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7、 以Class降序查询Student表的所有记录。
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select * from student order by class desc
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8、 以Cno升序、Degree降序查询Score表的所有记录。
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select * from Score order by cno asc ,degree desc
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9、 查询“95031”班的学生人数。
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select count (*) from student where class= ‘95031‘
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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)
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select Sno,Cno from Score where Degree=( select max (Degree) from Score)
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select Sno,Cno from Score order by Degree desc limit 0,1
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11、 查询每门课的平均成绩。
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select Cno, avg (degree) from Score group by Cno
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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。
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select avg (Degree) from score where Cno like ‘3%‘ and Cno in ( select Cno from score group by Cno having count (*)>=5) 用 in 不用= 是因为可能会有多个
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简单写法: select avg (Degree) from score where Cno like ‘3%‘ and group by Cno having count (*)>=5
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13、 查询分数大于70,小于90的Sno列。
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select Sno from Score where degree>70 and degree<90
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14、 查询所有学生的Sname、Cno和Degree列。
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select Sname, Cno,Degree from Score , student where Score.Sno=student.Sno
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15、 查询所有学生的Sno、Cname和Degree列。
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select Sno,Cname,Degree from Score , Course where Score.Cno=Course.Cno
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16、 查询所有学生的Sname、Cname和Degree列。
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select Sname,Cname,Degree from student,course,score where student.Sno=score.Sno and course.Cno=score.Cno
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join .. on 写法: select Sname,Cname,Degree from student join score on student.Sno=score.Sno join course on course.Cno=score.Cno
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17、 查询“95033”班学生的平均分。
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select avg (degree) as ‘class=95033‘ from Score where Sno in ( select Sno from Student where Class= ‘95033‘ )
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18、 假设使用如下命令建立了一个grade表:
create table grade(low int(3),upp int(3),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’)
现查询所有同学的Sno、Cno和rank列。
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select Sno,Cno,rank from Score,grade where degree between low and upp
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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。
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<span style= "color: #000000; font-size: 15px" >109同学,选修是3-105课的</span>
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select * from score where Cno= ‘3-105‘ and degree>( select max (degree ) from Score where Sno= ‘109‘ and Cno= ‘3-105‘ )
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<span style= "font-size: 15px" >109同学,没有选修3-105课</span>
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select * from score where Cno= ‘3-105‘ and degree>( select max (degree ) from Score where Sno= ‘109‘ )
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and degree<(
select
max
(degree )
from
Score
where
sno
in
(
select
Sno
from
score
group
by
Sno
having
count
(*)>1))
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选了多门课程并且是这个课程下不是最高分的
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select * from score a where Sno in ( select Sno from score group by Sno having count (*)>1) and degree<( select max (degree ) from Score b where b.cno = a.cno)
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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。
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Select * from score where degree>( select degree from Score where Sno= ‘109‘ and Cno= ‘3-105‘ )
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22、查询和学号为108、101的同学同年出生的所有学生的Sno、Sname和Sbirthday列。
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select sno,sname,sbirthday from student where year (sbirthday) = ( select year (sbirthday) from student where sno= ‘108‘ )
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select sno,sname,sbirthday from student where year (sbirthday) = ( select year (sbirthday) from student where sno= ‘101‘ )
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23、查询“张旭“教师任课的学生成绩。
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select Sno,degree from score,Course where score.Cno=Course.Cno and Course.Tno= ( select Tno from Teacher where Tname= ‘张旭‘ )
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select degree from score where Cno in ( select cno from course where Tno= ( select Tno from Teacher where Tname= ‘张旭‘ ) )
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24、查询选修某课程的同学人数多于5人的教师姓名。
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select Tname from Teacher, Course where Teacher.Tno=Course.Tno and Course.Cno =( select Cno from Score group by Cno having count (*)>5)
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select Tname from Teacher where tno=( select Tno from Course where cno=( select Cno from Score group by Cno having count (*)>5 ))
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25、查询95033班和95031班全体学生的记录。
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select * from student where class in ( ‘95033‘ , ‘95031‘ )
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26、 查询存在有85分以上成绩的课程Cno.
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select Cno from score where degree>85
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27、查询出“计算机系“教师所教课程的成绩表。
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select * from course where cno in ( select cno from course where tno in ( select tno from teacher where Depart= ‘计算机系‘ ))
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28、查询“计算 机系”与“电子工程系“不同职称的教师的Tname和Prof。
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select Tname,Prof from Teacher where Depart = ‘计算机系‘ and Prof not in ( select Prof from Teacher where Depart = ‘电子工程系‘ )<br> union <br> select Tname,Prof from Teacher where Depart = ‘电子工程系‘ and Prof not in ( select Prof from Teacher where Depart = ‘计算机系‘ )
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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。
any:代表括号中任意一个成绩就可以
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select Cno,Sno,Degree from score where cno= ‘3-105‘ and degree > any ( select degree from score where cno= ‘3-245‘ ) order by degree desc
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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.
all:代表括号中的所有成绩
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select Cno,Sno,Degree from score where cno= ‘3-105‘ and degree > all ( select degree from score where cno= ‘3-245‘ ) order by degree desc
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31、 查询所有教师和同学的name、sex和birthday.
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select tname,tsex,tbirthday from Teacher union select sname,ssex,sbirthday from Student
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32、查询所有“女”教师和“女”同学的name、sex和birthday.
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select Tname,Tsex,Tbirthday from Teacher where Tsex= ‘女‘ union select Sname,Ssex,Sbirthday from Student where Ssex= ‘女‘
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33、 查询成绩比该课程平均成绩低的同学的成绩表。
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select * from score a where degree < ( select avg (degree) from score b where b.cno=a.cno)
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34、 查询所有任课教师的Tname和Depart.
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select Tname,Depart from Teacher where tno in ( select tno from course )
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35 、 查询所有未讲课的教师的Tname和Depart.
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select Tname,Depart from Teacher where Tno not in ( select Tno from Course where cno in ( select cno from score ))
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36、查询至少有2名男生的班号。
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select class from student where ssex= ‘男‘ group by class having count (*)>1
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37、查询Student表中不姓“王”的同学记录。
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select * from Student where Sname not like ‘王%%‘
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38、查询Student表中每个学生的姓名和年龄。
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select Sname, year (now())- year (sbirthday) from Student
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39、查询Student表中最大和最小的Sbirthday日期值。
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select Max (Sbirthday ), Min (Sbirthday ) from Student
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40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
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select * from Student order by class desc , Sbirthday
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41、查询“男”教师及其所上的课程。
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select Tname,Cname from course,teacher where course.tno= teacher.tno and teacher.Tsex= ‘男‘
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42、查询最高分同学的Sno、Cno和Degree列。
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select Sno,Cno,Degree from score where degree=( select max (degree) from score)
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排序写法:
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select Sno,Cno,Degree from score order by degree desc limit 0,1
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43、查询和“李军”同性别的所有同学的Sname.
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select Sname from Student where Ssex = ( select Ssex from Student where Sname= ‘李军‘ )
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44、查询和“李军”同性别并同班的同学Sname.
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select Sname from Student where Ssex = ( select Ssex from Student where Sname= ‘李军‘ ) and class=( select class from student where Sname= ‘李军‘ )
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45、查询所有选修“计算机导论”课程的“男”同学的成绩表。
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select Sno,Cno,degree from score where Cno=( select Cno from course where Cname= ‘计算机导论‘ ) and Sno in ( select Sno from student where Ssex= ‘男‘ )
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