create database mydb go use mydb 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。 --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 select * 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 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 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。 select top 1 sno,cno from score order by degree desc 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 like '3%' and cno in ( select cno from score group by cno having COUNT(*) >=5 ) select AVG(degree) 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,MAX(degree),MIN(degree) from score group by sno having MAX(degree) < 90 and MIN(degree)>70 --14、查询所有学生的Sname、Cno和Degree列。 select 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 sno,cname,DEGREE from course join score 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”班所选课程的平均分。 select AVG(degree) from student join score on student.sno = score.sno 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 score select * from grade select sno,cno,rank from score join grade on 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。//无关子查询 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。 //相关子查询 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 * from student where year(sbirthday) = ( select year(sbirthday) from student where sno = '109' ) --23、查询“张旭“教师任课的学生成绩。 select * from teacher join course on teacher.tno = course.tno join score on course.cno = score.cno where tname='张旭' select * 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 in ( select tno from course where cno in ( 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') select * from student where class='95033' union select * from student where class='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 select 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 teacher select * from course select * from score select score.sno,score.cno,score.degree from teacher join course on teacher.tno = course.tno join score on course.cno = score.cno 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。 //相关子查询 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。 --查询3-105大于3-245最高份的所有的成绩记录 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.//相关子查询 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 tname,tsex,tbirthday from teacher union select sname,ssex,sbirthday from student --32、查询所有“女”教师和“女”同学的name、sex和birthday. select tname,tsex,tbirthday from teacher where tsex='女' union select sname,ssex,sbirthday from student where ssex ='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 --求每门科的平均分 --求成绩低于平均分的成绩 select * from score s1 where degree < ( select 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 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 tno 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' select * from course where tno in ( select tno from teacher 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 * from student where ssex= ( select ssex from student where sname='李军' ) and class= ( select class from student where sname='李军' ) select * from student s1 where ssex= ( select ssex from student s2 where sname='李军' and s1.class=s2.class ) --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 score.cno = course.cno join student on score.sno = student.sno where cname = '计算机导论' and ssex='男' select * from student where ssex='男' and sno in ( select sno from score where cno in ( select cno from course where cname='计算机导论' ) ) --46、查询score表中分数最高的学生的信息。//多层嵌套 select * from student where sno in ( 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。//无关查询 select * from student where sno in ( select sno from score group by sno having AVG(degree)>80 )