一、创建数据库和表

drop table student;

create table student

(

  sid int,

  sname varchar2(100),

  sage int,

  ssex char(3),

  snativeplace varchar2(100),

  smajor varchar2(100),

  sclass varchar2(100),

  snative varchar2(100)

);

drop table course;

create table course

(

  cid int,

  cname varchar2(100),

  cval int,

  ctime int,

  tid int

);

drop table mark;

create table mark

(

  sid int,

  cid int,

  cmark int

);

drop table teacher;

create table teacher

(

  tid int,

  tname varchar2(100),

  tsex char(3),

  tage int,

  tlvl varchar2(100)

);

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10001,'廖官忠',21,'男','福建','信计','2班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10002,'张三',20,'男','江苏','信计','2班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10003,'李四',19,'男','福建','信计','2班','傣族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10004,'萧瑾',21,'女','福建','统计','1班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10005,'叶晶',21,'女','上海','传煤','1班','朝鲜族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10006,'萧瑾',19,'女','北京','统计','2班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10007,'李宁',21,'男','云南','信控','1班','傣族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10008,'唐品',18,'男','江苏','信计','2班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10009,'吴强',20,'男','山东','统计','1班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10010,'欧阳锋',22,'男','四川','应数','1班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10011,'王充样',23,'男','黑龙江','统计','2班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10012,'卫小宝',17,'女','福建','统计','2班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10013,'李绍',21,'女','福建','信计','2班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10014,'黄马华',22,'男','浙江','心理学','1班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10015,'艾蔚儿',19,'女','福建','计算机','1班','黎族');

commit;

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10016,'赵若辰',21,'男','江苏','心理学','1班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10017,'徐扬',22,'男','青海','计算机','1班','汉族');

insert into student (sid,sname,sage,ssex,snativeplace,smajor,sclass,snative) values (10018,'徐静静',19,'女','安徽','计算机','1班','黎族');

insert into course (cid,cname,cval,ctime,tid) values (2001,'数学',6,64,30001);

insert into course (cid,cname,cval,ctime,tid) values (2002,'英语',4,64,30002);

insert into course (cid,cname,cval,ctime,tid) values (2003,'体育',2,32,30003);

insert into course (cid,cname,cval,ctime,tid) values (2004,'马克思主义',6,64,30004);

insert into course (cid,cname,cval,ctime,tid) values (2005,'计算机基础',3,48,30005);

insert into course (cid,cname,cval,ctime,tid) values (2006,'心理学',4,48,30006);

insert into course (cid,cname,cval,ctime,tid) values (2007,'空间天气学',6,64,30007);

insert into teacher (tid,tname,tsex,tage,tlvl) values (30001,'马六','男',45,'高级教师');

insert into teacher (tid,tname,tsex,tage,tlvl) values (30002,'胡美丽','女',32,'中级教师');

insert into teacher (tid,tname,tsex,tage,tlvl) values (30003,'李强','男',40,'高级教师');

insert into teacher (tid,tname,tsex,tage,tlvl) values (30004,'胡适','男',55,'教授');

insert into teacher (tid,tname,tsex,tage,tlvl) values (30005,'钱枫','男',37,'高级教师');

insert into teacher (tid,tname,tsex,tage,tlvl) values (30006,'戴安安','女',27,'中级教师');

insert into teacher (tid,tname,tsex,tage,tlvl) values (30007,'张伯伦','男',47,'教授');

drop table teacher

create table teacher

(

  tid int,

  tname varchar2(100),

  tsex char(2),

  tage int,

  tlvl varchar2(100)

)

insert into mark (sid,cid,cmark) values (10001,2001,85);

insert into mark (sid,cid,cmark) values (10001,2002,75);

insert into mark (sid,cid,cmark) values (10001,2003,80);

insert into mark (sid,cid,cmark) values (10001,2004,70);

insert into mark (sid,cid,cmark) values (10001,2005,60);

insert into mark (sid,cid,cmark) values (10001,2006,95);

insert into mark (sid,cid,cmark) values (10001,2007,70);

insert into mark (sid,cid,cmark) values (10002,2001,80);

insert into mark (sid,cid,cmark) values (10002,2002,65);

insert into mark (sid,cid,cmark) values (10002,2003,70);

insert into mark (sid,cid,cmark) values (10002,2004,80);

insert into mark (sid,cid,cmark) values (10002,2005,55);

insert into mark (sid,cid,cmark) values (10002,2006,78);

insert into mark (sid,cid,cmark) values (10002,2007,82);

insert into mark (sid,cid,cmark) values (10003,2001,69);

insert into mark (sid,cid,cmark) values (10003,2002,57);

insert into mark (sid,cid,cmark) values (10003,2003,90);

insert into mark (sid,cid,cmark) values (10003,2004,80);

insert into mark (sid,cid,cmark) values (10003,2005,77);

insert into mark (sid,cid,cmark) values (10003,2006,92);

insert into mark (sid,cid,cmark) values (10003,2007,80);

insert into mark (sid,cid,cmark) values (10004,2001,85);

insert into mark (sid,cid,cmark) values (10004,2002,76);

insert into mark (sid,cid,cmark) values (10004,2003,66);

insert into mark (sid,cid,cmark) values (10004,2004,54);

insert into mark (sid,cid,cmark) values (10004,2005,80);

insert into mark (sid,cid,cmark) values (10004,2006,73);

insert into mark (sid,cid,cmark) values (10004,2007,80);

insert into mark (sid,cid,cmark) values (10005,2001,93);

insert into mark (sid,cid,cmark) values (10005,2002,82);

insert into mark (sid,cid,cmark) values (10005,2003,71);

insert into mark (sid,cid,cmark) values (10005,2004,68);

insert into mark (sid,cid,cmark) values (10005,2005,70);

insert into mark (sid,cid,cmark) values (10005,2006,86);

insert into mark (sid,cid,cmark) values (10005,2007,90);

insert into mark (sid,cid,cmark) values (10006,2001,69);

insert into mark (sid,cid,cmark) values (10006,2002,48);

insert into mark (sid,cid,cmark) values (10006,2003,90);

insert into mark (sid,cid,cmark) values (10006,2004,68);

insert into mark (sid,cid,cmark) values (10006,2005,80);

insert into mark (sid,cid,cmark) values (10006,2006,88);

insert into mark (sid,cid,cmark) values (10006,2007,70);

insert into mark (sid,cid,cmark) values (10007,2001,77);

insert into mark (sid,cid,cmark) values (10007,2002,75);

insert into mark (sid,cid,cmark) values (10007,2003,82);

insert into mark (sid,cid,cmark) values (10007,2004,67);

insert into mark (sid,cid,cmark) values (10007,2005,84);

insert into mark (sid,cid,cmark) values (10007,2006,95);

insert into mark (sid,cid,cmark) values (10007,2007,73);

insert into mark (sid,cid,cmark) values (10008,2001,97);

insert into mark (sid,cid,cmark) values (10008,2002,86);

insert into mark (sid,cid,cmark) values (10008,2003,68);

insert into mark (sid,cid,cmark) values (10008,2004,81);

insert into mark (sid,cid,cmark) values (10008,2005,71);

insert into mark (sid,cid,cmark) values (10008,2006,78);

insert into mark (sid,cid,cmark) values (10008,2007,64);

insert into mark (sid,cid,cmark) values (10009,2001,90);

insert into mark (sid,cid,cmark) values (10009,2002,75);

insert into mark (sid,cid,cmark) values (10009,2003,60);

insert into mark (sid,cid,cmark) values (10009,2004,57);

insert into mark (sid,cid,cmark) values (10009,2005,90);

insert into mark (sid,cid,cmark) values (10009,2006,85);

insert into mark (sid,cid,cmark) values (10009,2007,91);

insert into mark (sid,cid,cmark) values (10010,2001,85);

insert into mark (sid,cid,cmark) values (10010,2002,62);

insert into mark (sid,cid,cmark) values (10010,2003,72);

insert into mark (sid,cid,cmark) values (10010,2004,81);

insert into mark (sid,cid,cmark) values (10010,2005,91);

insert into mark (sid,cid,cmark) values (10010,2006,90);

insert into mark (sid,cid,cmark) values (10010,2007,66);

insert into mark (sid,cid,cmark) values (10011,2001,55);

insert into mark (sid,cid,cmark) values (10011,2002,75);

insert into mark (sid,cid,cmark) values (10011,2003,67);

insert into mark (sid,cid,cmark) values (10011,2004,87);

insert into mark (sid,cid,cmark) values (10011,2005,88);

insert into mark (sid,cid,cmark) values (10011,2006,77);

insert into mark (sid,cid,cmark) values (10011,2007,61);

insert into mark (sid,cid,cmark) values (10012,2001,77);

insert into mark (sid,cid,cmark) values (10012,2002,81);

insert into mark (sid,cid,cmark) values (10012,2003,91);

insert into mark (sid,cid,cmark) values (10012,2004,67);

insert into mark (sid,cid,cmark) values (10012,2005,60);

insert into mark (sid,cid,cmark) values (10012,2006,80);

insert into mark (sid,cid,cmark) values (10012,2007,74);

insert into mark (sid,cid,cmark) values (10013,2001,88);

insert into mark (sid,cid,cmark) values (10013,2002,75);

insert into mark (sid,cid,cmark) values (10013,2003,90);

insert into mark (sid,cid,cmark) values (10013,2004,60);

insert into mark (sid,cid,cmark) values (10013,2005,71);

insert into mark (sid,cid,cmark) values (10013,2006,95);

insert into mark (sid,cid,cmark) values (10013,2007,89);

insert into mark (sid,cid,cmark) values (10014,2001,65);

insert into mark (sid,cid,cmark) values (10014,2002,72);

insert into mark (sid,cid,cmark) values (10014,2003,68);

insert into mark (sid,cid,cmark) values (10014,2004,67);

insert into mark (sid,cid,cmark) values (10014,2005,60);

insert into mark (sid,cid,cmark) values (10014,2006,75);

insert into mark (sid,cid,cmark) values (10014,2007,81);

insert into mark (sid,cid,cmark) values (10015,2001,55);

insert into mark (sid,cid,cmark) values (10015,2002,67);

insert into mark (sid,cid,cmark) values (10015,2003,61);

insert into mark (sid,cid,cmark) values (10015,2004,71);

insert into mark (sid,cid,cmark) values (10015,2005,81);

insert into mark (sid,cid,cmark) values (10015,2006,88);

insert into mark (sid,cid,cmark) values (10015,2007,90);

insert into mark (sid,cid,cmark) values (10016,2001,72);

insert into mark (sid,cid,cmark) values (10016,2002,82);

insert into mark (sid,cid,cmark) values (10016,2003,92);

insert into mark (sid,cid,cmark) values (10016,2004,62);

insert into mark (sid,cid,cmark) values (10016,2005,63);

insert into mark (sid,cid,cmark) values (10016,2006,73);

insert into mark (sid,cid,cmark) values (10016,2007,83);

insert into mark (sid,cid,cmark) values (10017,2001,85);

insert into mark (sid,cid,cmark) values (10017,2002,77);

insert into mark (sid,cid,cmark) values (10017,2003,87);

insert into mark (sid,cid,cmark) values (10017,2004,79);

insert into mark (sid,cid,cmark) values (10017,2005,69);

insert into mark (sid,cid,cmark) values (10017,2006,58);

insert into mark (sid,cid,cmark) values (10017,2007,74);

insert into mark (sid,cid,cmark) values (10018,2001,88);

insert into mark (sid,cid,cmark) values (10018,2002,78);

insert into mark (sid,cid,cmark) values (10018,2003,88);

insert into mark (sid,cid,cmark) values (10018,2004,78);

insert into mark (sid,cid,cmark) values (10018,2005,68);

insert into mark (sid,cid,cmark) values (10018,2006,98);

insert into mark (sid,cid,cmark) values (10018,2007,78);

commit;

二、题目

1.在学生表中找出人数至少是三个的地区

select snativeplace  from student group by snativeplace having count(*)>=3 /*having扫描的是每个小组*/

2.找出各地区女生年龄数目

select snativeplace,count(distinct sage) from student  where ssex='女' group by   snativeplace

3.找出各个地区女生的数学平均分

select snativeplace ,avg(cmark) from student,mark,course where student.sid=mark.sid and mark.cid=course.cid and ssex='女' and cname='数学'

group by snativeplace  order by avg(cmark)

4.找出各个地区各门课的均分

select snativeplace ,cname,avg(cmark) from student s,mark sc,course c where s.sid=sc.sid and sc.cid=c.cid group by snativeplace ,c.cid,cname

5.找出低于所有人平均分的学生姓名

select sname from student where sid in(select sid from mark group by sid having avg(cmark)<(select avg(cmark)from mark))

6.找出年龄降序排序的3-6名学生信息

select * from(select * from( select * from student order by sage desc)where rownum<=7) order by sage

select *from(

select * from(select * from(

select * from student order by sage desc)where rownum<=7

) order by sage

) where rownum<=5 order by sage desc

7.找出年龄最大学生

方法1：排序取第一条

select * from( select * from student order by sage desc) t where rownum=1

访法2：找到最大值，其次扫描那些记录的数值等于这个最大值

step1:select max(sage) from student

step2:select* from student where sage=(step1)

方法三：直接和原表的所有记录进行对比，大于等于他们所有记录则成立

select * from student where sage>=all(select sage from student)

方法4：排除法

select * from student where not sage<any(select sage from student)

8.找出均分最高的学生姓名

select*from(

select mark.sid,sname,avg(cmark) from mark,student where mark.sid=student.sid group by mark.sid,sname order by avg(cmark) desc )

where rownum=1

select * from student where sid in(select sid from mark  group by sid having avg(cmark)>=all(select avg(cmark) from mark group by sid))

9.找出均分最高的女生姓名

step1:select sid from student where ssex='女' /*找出女生学号*/

step2:select sid avg(cmark)amk from mark where sid in (step1)group by sid/*计算出女生均分表*/

step3:select sid from(step2)where amk>=all(select amk from step2)/*使用>=all的方式找到最高均分的学号*/

step4:select snme from student where sid in(step3)/*在学生表中兑换成姓名*/

10.找出数学成绩最高的学生姓名

step1: select sid from student where ssex='女'

step2: select cid from course where canme='数学'

step3: select * from mark where sid in(step1) and cid=(step2)

step4: select max(cmark) from (step3)

step5:select sid from (step3) where cmark =(step4)

step5:select sname from student where sid in(step5)

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Orcle数据库查询练习复习：一

一、创建数据库和表

二、题目

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