create database testgouse testgocreate 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))gocreate 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))gocreate 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))gocreate 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))goinsert into studentvalues(‘108‘,‘曾华‘,‘男‘,‘1977-09-01‘,‘95033‘)insert into studentvalues(‘105‘,‘匡明‘,‘男‘,‘1975-10-02‘,‘95031‘)insert into studentvalues(‘107‘,‘王丽‘,‘女‘,‘1976-01-23‘,‘95033‘)insert into studentvalues(‘101‘,‘李军‘,‘男‘,‘1976-02-20‘,‘95033‘)insert into studentvalues(‘109‘,‘王芳‘,‘女‘,‘1975-02-10‘,‘95031‘)insert into studentvalues(‘103‘,‘陆君‘,‘男‘,‘1974-06-03‘,‘95031‘)insert into teachervalues(‘804‘,‘李诚‘,‘男‘,‘1958-12-02‘,‘副教授‘,‘计算机系‘)insert into teachervalues(‘856‘,‘张旭‘,‘男‘,‘1969-03-12‘,‘讲师‘,‘电子工程系‘)insert into teachervalues(‘825‘,‘王萍‘,‘女‘,‘1972-05-05‘,‘助教‘,‘计算机系‘)insert into teachervalues(‘831‘,‘刘冰‘,‘女‘,‘1958-08-14‘,‘助教‘,‘电子工程系‘)insert into coursevalues(‘3-105‘,‘计算机导论‘,‘825‘)insert into coursevalues(‘3-245‘,‘操作系统‘,‘804‘)insert into coursevalues(‘6-166‘,‘数字电路‘,‘856‘)insert into coursevalues(‘9-888‘,‘高等数学‘,‘831‘)insert into scorevalues(‘103‘,‘3-245‘,‘86‘)insert into scorevalues(‘105‘,‘3-245‘,‘75‘)insert into scorevalues(‘109‘,‘3-245‘,‘68‘)insert into scorevalues(‘103‘,‘3-105‘,‘92‘)insert into scorevalues(‘105‘,‘3-105‘,‘88‘)insert into scorevalues(‘109‘,‘3-105‘,‘76‘)insert into scorevalues(‘101‘,‘3-105‘,‘64‘)insert into scorevalues(‘107‘,‘3-105‘,‘91‘)insert into scorevalues(‘108‘,‘3-105‘,‘78‘)insert into scorevalues(‘101‘,‘6-166‘,‘85‘)insert into scorevalues(‘107‘,‘6-166‘,‘79‘)insert into scorevalues(‘108‘,‘6-166‘,‘81‘)select * from student select * from teacher select * from courseselect * from score

--每个题最后一句是结果，上面是过程--1、 查询Student表中的所有记录的Sname、Ssex和Class列。select *from studentselect sname,ssex,class from student--2、 查询教师所有的单位即不重复的Depart列。select*from teacherselect 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 scoreselect degree from score where degree between 60 and 80select degree 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 scoreselect *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 studentselect*from student where class=‘95031‘ or ssex=‘女‘--7、 以Class降序查询Student表的所有记录。select *from studentselect *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*from studentselect COUNT(*) ‘95031班‘ 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*from scoreselect MAX(degree) from scoreselect sno,cno from score where degree=(select MAX(degree) from score)--11、查询‘3-105’号课程的平均分。select *from scoreselect degree from score where sno=‘105‘select AVG(degree) from score where degree in(select degree from score where sno=‘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*from scoreselect AVG(degree) from score where cno like ‘3%‘ and cno=(select cno from score group by cno  having COUNT(*)>5)--13、查询最低分大于70，最高分小于90的学生的Sno列。select*from scoreselect 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*from studentselect*from scoreselect sname,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*from courseselect*from scoreselect sno,cname,degree from course join score on course.cno=score.cno--16、查询所有学生的Sname、Cname和Degree列。select*from studentselect*from courseselect*from scoreselect sname,cname,degree from student join score 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*from studentselect*from scoreselect*from student where class=‘95033‘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  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 *from gradeselect*from scoreselect sno,cno,rank from score join grade on degree>=low --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 scoreselect*from studentselect degree from score where cno=‘3-105‘and sno=‘109‘select *from student join score on student.sno=score.sno where student.sno in(select sno from score where cno=‘3-105‘and degree>‘76.0‘)--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 scoreselect COUNT(cno) from score group by sno having COUNT(*)>1select cno,MAX(degree) from score group by cnoselect sno from score where degree in(select MAX(degree) from score group by cno) select *from score where sno not in(select sno from score where degree in(select MAX(degree)  from score 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 studentselect*from scoreselect degree from score where sno=‘109‘and cno=‘3-105‘select *from student join score on student.sno=score.sno 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 *from studentselect year(sbirthday) from student where sno=‘108‘select *from student where DAY(sbirthday)in(select day(sbirthday) from student where  sno=‘108‘)select sno,sname,sbirthday  from student where year(sbirthday) in(select year(sbirthday) from student where  sno=‘108‘)and sno!=‘108‘--23、查询“张旭“教师任课的学生成绩。select*from teacherselect*from courseselect*from scoreselect*from teacher join course on teacher.tno=course.tno select tno from teacher where tname=‘张旭‘select cno from course where tno=‘856‘select degree from score where cno=‘6-166‘select degree from score 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*from teacherselect*from courseselect*from scoreselect cno from score group by cno having COUNT(*)>5select tno from course where cno=‘3-105‘select tname from teacher where tno=‘825‘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*from student where class in(‘95033‘,‘95031‘)--26、查询存在有85分以上成绩的课程Cno.select*from scoreselect*from courseselect cno,MAX(degree) as ‘课程最高分‘from score group by cno having MAX(degree)>85select cno from score group by cno having MAX(degree)>85--27、查询出“计算机系“教师所教课程的成绩表。select*from teacherselect tno from teacher where depart=‘计算机系‘select cno from course where tno in(‘804‘,‘825‘)select degree from score where cno in(‘3-105‘,‘3-245‘) select degree 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 teacherselect tname,prof from teacher where depart in( ‘计算机系‘,‘电子工程系‘)select prof,COUNT(prof) from teacher group by prof having COUNT(prof)=1select tname,prof from teacher where prof in(select prof from teacher group by prof having COUNT(prof)=1)and (depart=‘计算机系‘or depart=‘电子工程系‘)--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 scoreselect MAX(degree) from score where cno=‘3-245‘ select degree from score where cno=‘3-105‘and degree>(select max(degree) from score where cno=‘3-245‘)select degree from score where cno=‘3-105‘and degree>(select max(degree) from score where cno=‘3-245‘)select degree from score where degree in(‘92.0‘,‘88.0‘,‘91.0‘) order  by degree descselect * from score where degree in(select degree 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 scoreselect * from score where cno=‘3-105‘and degree>(select MAX(degree) from score where cno=‘3-245‘)--31、查询所有教师和同学的name、sex和birthday.select*from studentselect*from teacherselect sname as ‘name‘,ssex as ‘sex‘,sbirthday as ‘birthday‘ from studentunionselect tname,tsex,tbirthday from teacher--32、查询所有“女”教师和“女”同学的name、sex和birthday.select*from teacherselect*from studentselect sname as ‘name‘,ssex as ‘sex‘,sbirthday as ‘birthday‘ from student where ssex=‘女‘unionselect 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。//相关子查询select *from scoreselect AVG(degree) from score group by cnoselect * from score where degree < any(select AVG(degree) from score group by cno)--34、查询所有任课教师的Tname和Depart.select*from teacherselect*from scoreselect*from courseselect distinct cno from scoreselect tno from course where cno in(‘3-105‘,‘3-245‘,‘6-166‘)select tname,depart from teacher where tno in(‘825‘,‘804‘,‘856‘) select tname,depart from teacher where tno in(select tno from course where cno in(select distinct cno from score)) --35  查询所有未讲课的教师的Tname和Depart. --insert into teacher values(‘888‘,‘aaa‘,‘v‘,‘2005.1.1‘,‘a‘,‘a‘)select *from teacherselect *from courseselect *from scoreselect distinct cno from score select tno from course where cno in(‘3-105‘,‘3-245‘,‘6-166‘)select *from teacher where tno not in(‘825‘,‘804‘,‘856‘)select *from teacher where tno not in(select tno from course where cno in(select distinct cno from score))--36、查询至少有2名男生的班号。--insert into student values(‘110‘,‘aaa‘,‘a‘,‘2005.1.1‘,‘95000‘)select*from studentselect class,COUNT(ssex) from student group by class having COUNT(*)>=2 select class from student where ssex=‘男‘select*from student where sno in (select sno from student where ssex=‘男‘)select class from student WHERE ssex=‘男‘ group by class having count(class)>1--37、查询Student表中不姓“王”的同学记录。select *from studentselect *from student where sname not like ‘王%‘--38、查询Student表中每个学生的姓名和年龄。select*from studentselect sname,(YEAR(GETDATE())-year(sbirthday))as ‘年龄‘ from student--39、查询Student表中最大和最小的Sbirthday日期值。select *from student select MAX(12-month(sbirthday)) from student select sbirthday  from student where MONTH(sbirthday)=(select MAX(month(sbirthday)) from student) and day(sbirthday)=(select MAX(day(sbirthday)) from student)select sbirthday  from student where day(sbirthday)=(select min(day(sbirthday)) from student)select top(1) sbirthday from student order by month(sbirthday) asc,day(sbirthday) ascselect top(1) sbirthday from student order by month(sbirthday) desc,day(sbirthday) descselect min(sbirthday)as ‘最大日期值‘,max(sbirthday)as ‘最小日期值‘  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 select*from student select * from student order by (YEAR(GETDATE())-year(sbirthday)) desc,class asc--41、查询“男”教师及其所上的课程。select*from teacher select*from courseselect tname from teacher where tsex=‘男‘unionselect cname  from course where tno in(select tno from teacher where tsex=‘男‘)select tname,cname from teacher join course on teacher.tno=course.tno where course.tno in(select tno from teacher where tsex=‘男‘)and tsex=‘男‘--42、查询最高分同学的Sno、Cno和Degree列。select*from score select MAX(degree) from score select  sno,cno,degree 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‘)and sname!=‘李军‘--44、查询和“李军”同性别并同班的同学Sname.select*from student select ssex from student where sname=‘李军‘select class from student where sname=‘李军‘select  sname from student where ssex=(select ssex from student where sname=‘李军‘)and class=(select class from student where sname=‘李军‘)and 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 courseselect*from studentselect*from scoreselect cno from course where cname=‘计算机导论‘select  sno from score where cno=‘3-105‘select sname,degree from student join score on student.sno=score.sno where  ssex=‘男‘and  cno=(select cno from course where cname=‘计算机导论‘)