create database xinxikugouse xinxikugocreate table Student(    Sno char(3) primary key,    Sname char(8) not null,    Ssex char(2) not null,    Sbirthday date ,    Class char(5) )gocreate table Teacher(    Tno char(3) primary key,    Tname char(4) not null,    Tsex char(2) not null,    Tbirthday date ,    Prof char(6),    Depart varchar(10) not null)gocreate table Course(    Cno char(5) primary key,    Cname varchar(10) not null,    Tno  char(3) references [dbo].[Teacher]([Tno]) not null)gocreate table Score(    Sno char(3) references [dbo].[Student]([Sno]) ,    Cno char(5) references [dbo].[Course]([Cno]) ,    primary key (Sno,Cno),    Degree decimal(4,1) )go--------------------Student------------------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‘)-------------Teacher--------------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‘)-----------------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‘)------------------Score--------------------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‘)--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 Ssex=‘女‘ or Class=‘95031‘--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 from Score where Sno=(select Sno from Score where Degree=(select MAX(degree)from Score))--11、 查询每门课的平均成绩。select Cno,AVG(Degree) 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%‘--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 Sname,Cno,Degree from Student,Score where Student.Sno=Score.Sno --15、查询所有学生的Sno、Cname和Degree列。select Sno,Cname,Degree from Score,Course where Score.Cno=Course.Cno--16、查询所有学生的Sname、Cname和Degree列。select Sname,Cname,Degree from Student,Score,Course where Score.Sno=Student.Sno and Score.Cno=Course.Cno--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,Degree,[rank] from Score,grade where Degree between low and upp order by Degree--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 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 Sno from score where  (select COUNT(*)from Score group by Sno)>1select Degree from score where Degree not in (select max(Degree) from score group by sno)-------------select Degree from score where Degree not 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 Score where 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 Sbirthday like (select DATENAME(YEAR,(select Sbirthday from Student where Sno=‘108‘))+‘%‘)--23、查询“张旭“教师任课的学生成绩。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 Tname from Teacher where Tno=(--查询教师姓名select Tno from Course where Cno=(--查询教师编号select Cno from Score group by Cno having COUNT(*)>5))--查询课程编号--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--去重--27、查询出“计算机系“教师所教课程的成绩表。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 Tname,Prof from Teacher where Prof not in(select prof from Teacher 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。select * from Score where Degree>(select MAX(Degree) from Score where Cno=‘3-245‘) and Cno=‘3-105‘ 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 where Degree>(select MAX(Degree) from Score where Cno=‘3-245‘) and Cno=‘3-105‘--31、 查询所有教师和同学的name、sex和birthday.select Sname,Ssex,Sbirthday 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 Sname,Ssex,Sbirthday 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。select * from Score where Degree <any(select AVG(Degree) from Score group by Cno)--select Degree from Score where Cno=     Degree <(select AVG(Degree) 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 Tname,Depart from Teacher where Tno in(select Tno from Course where Cno not in(select Cno from Score group by Cno))--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,nianling=(select DATEDIFF(YEAR,Sbirthday,GETDATE())) from Student--39、查询Student表中最大和最小的Sbirthday日期值。select max(Sbirthday)as [max],MIN(Sbirthday) as[min] 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 Teacher.Tno,Tname,Tsex,Cname,Cno 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 Degree from Score where Sno in(select Sno from Student where Ssex=‘男‘)and Cno in(select Cno from Course where Cname=‘计算机导论‘)---------------------------------select *from Teacher--教师信息select *from Course--课程信息select *from Score--分数，课程select *from Student--学生信息------------------------------------33、 查询成绩比该课程平均成绩低的同学的成绩表。select AVG(Degree) from Score group by Cnoselect Cno from Score group by Cno