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140908●SQL练习
create database taskgouse taskcreate 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 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 studentselect * from teacherselect * from courseselect * 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。//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。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。--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。--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.--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。--34、查询所有任课教师的Tname和Depart.select distinct tname,depart from teacher join course on course.tno=teacher.tno join score on score.cno=course.cno --35 查询所有未讲课的教师的Tname和Depart. select distinct tname,depart from teacher join course on course.tno=teacher.tno 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,(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,sbirthday--41、查询“男”教师及其所上的课程。select distinct tname,cname 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 distinct score.* 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 student.ssex=‘男‘--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= ( 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。//相关查询。无关查询select * from student where sno= ( select sno from score group by sno having avg(degree)>80 )
140908●SQL练习
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