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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,,1977-09-01,95033)insert into studentvalues(105,匡明,,1975-10-02,95031)insert into studentvalues(107,王丽,,1976-01-23,95033)insert into studentvalues(101,李军,,1976-02-20,95033)insert into studentvalues(109,王芳,,1975-02-10,95031)insert into studentvalues(103,陆君,,1974-06-03,95031)insert into teachervalues(804,李诚,,1958-12-02,副教授,计算机系)insert into teachervalues(856,张旭,,1969-03-12,讲师,电子工程系)insert into teachervalues(825,王萍,,1972-05-05,助教,计算机系)insert into teachervalues(831,刘冰,,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=--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=unionselect tname,tsex,tbirthday from teacher    where tsex=--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=    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=--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=--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