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  • 数据库练习(学生表)

    创建表

    1、创建学生表,分数表和课程表

    create  table student(

     sid     int(11) primary key not null,

     sname   char(25) not null,

     age     int(11) not null,

     sex     char(2) not null,

     department char(40) ,

     address  char(200) ,

     birthplace  varchar(256)

    );

    create  table sc(

      sid   int(11) not null,

      cid   int(11) not null,

      grade int(11)

    );

    create  table course(

      cid    int(11) not null primary key default 4,

      cname  char(40),

      teacher  char(40)

    );

    #以下是插入课程表的数据

    delete from course ;

    insert into course values('8108001','math','sandy');

    insert into course values('8108002','english','sherry');

    insert into course values('8108003','computer','sandy');

    insert into course values('8108004','web','sandy');

    insert into course values('8108005','java','sandy');

    insert into course values('8108006','C languge','sherry');

    insert into course values('8108007','python','xiaozhu');

    insert into course values('8108008','testing','xiaozhu');

    insert into course values('8108009','linux','sherry');

    insert into course values('8108010','shell','sherry');

    #以下是插入成绩级表的数据

    delete from sc;

    insert into sc values('3108001','8108010','90');

    insert into sc values('3108001','8108003','67');

    insert into sc values('3108002','8108003','54');

    insert into sc values('3108002','8108010','84');

    insert into sc values('3108003','8108003','78');

    insert into sc values('3108004','8108004','89');

    insert into sc values('3108005','8108006','56');

    insert into sc values('3108006','8108005','60');

    insert into sc values('3108007','8108004','79');

    insert into sc values('3108008','8108008','89');

    insert into sc values('3108009','8108002','46');

    insert into sc values('3108010','8108003','87');

    insert into sc values('3108011','8108001','85');

    insert into sc values('3108011','8108002','81');

    insert into sc values('3108012','8108001','97');

    insert into sc values('3108012','8108002','55');

    insert into sc values('3108013','8108002','86');

    insert into sc values('3108013','8108001','71');

    insert into sc values('3108014','8108002','69');

    insert into sc values('3108014','8108001','78');

    insert into sc values('3108015','8108002','67');

    insert into sc values('3108016','8108001','85');

    insert into sc values('3108016','8108003','85');

    insert into sc values('3108016','8108002','85');

    insert into sc values('3108016','8108004','85');

    insert into sc values('3108016','8108005','85');

    insert into sc values('3108016','8108006','80');

    insert into sc values('3108016','8108007','79');

    insert into sc values('3108016','8108009','36');

    insert into sc values('3108016','8108010','78');

    insert into sc values('3108016','8108008','88');

    insert into sc values('3108016','8108021','83');

    insert into sc values('3108015','8108001','85');

    insert into sc values('3108015','8108003','85');

    insert into sc values('3108015','8108004','85');

    insert into sc values('3108015','8108005','85');

    insert into sc values('3108015','8108006','80');

    insert into sc values('3108015','8108007','79');

    insert into sc values('3108015','8108009','36');

    insert into sc values('3108015','8108010','78');

    insert into sc values('3108015','8108008','88');

    insert into sc values('3108015','8108021','83');

    #以下是插入学生信息数据

    delete from student;

    insert into student values('3108001','wang min',21,'f','computer-tec','zhongshan

    road','jiangsu');

    insert into student values('3108002','jidu',20,'m','english','zhongshan road','fujian');

    insert into student values('3108003','wangqing',19,'f','computer-tec','zhongshan

    road','jiangsu');

    insert into student values('3108004','liuxin',23,'f','chinese','zhongshan road','shanghai');

    insert into student values('3108005','ligu',22,'f','computer-tec','zhongshan road','jiangsu');

    insert into student values('3108006','songjia',19,'m','english','zhongshan road','jiangsu');

    insert into student values('3108007','huamao',20,'f','chinese','zhongshan road','shanghai');

    insert into student values('3108008','zhujiao',21,'f','english','zhongshan road','jiangsu');

    insert into student values('3108009','wuyi',23,'m','computer-tec','zhongshan road','jiangsu');

    insert into student values('3108010','jilian',18,'f','chinese','zhongshan road','hunan');

    insert into student values('3108011','linbiao',22,'m','computer-tec','zhongshan

    road','jiangsu');

    insert into student values('3108012','maoguai',21,'m','english','zhongshan road','fujian');

    insert into student values('3108013','rongqi',23,'m','computer-tec','zhongshan

    road','jiangsu');

    insert into student values('3108014','sangzi',20,'f','chinese','zhongshan road','hunan');

    insert into student values('3108015','surui',16,'f','computer-tec','zhongshan road','fujian');

    insert into student values('3108016','liushaoqi',24,'m','english','zhongshan road','hunan');

    commit;

    问题列表

    1.sandy老师所教的课程号、课程名称;

    select c.cid,cname from student s,sc,course c where s.sid=sc.sid and sc.cid=c.cid and teacher='sandy';

    2.年龄大于20岁的女学生的学号和姓名;

    select s.sid,sname from student s where age>20 and sex=f;

    3.在学生表中按性别排序,且男在前女在后显示记录。

    select * from student order by sex desc;

    4.“wuyi”所选修的全部课程名称;

    select cname from student s,sc t,course c where s.sid=t.sid and t.cid=c.cid and sname='wuyi';

    5.所有成绩都在80分以上的学生姓名及所在系;

    select DISTINCT sname,department from student s,sc t,course c where s.sid=t.sid and t.cid=c.cid and t.sid  not in (select sid from sc where grade<80 );

    6.没有选修“english”课的学生的姓名;

    select sname from student where   not sid in(SELECT sid from sc where cid in(SELECT cid from

    course where cname = 'english' ))

    7.与“jilian”同乡的男生姓名及所在系;

    select sname,department from student where sex='m' and birthplace = (select birthplace from student where sname='jilian');

    8.英语成绩比数学成绩好的学生;

    select * from student s,(select t.sid,grade from sc t,course c,student s where c.cid=t.cid and s.sid=t.sid and cname = 'english') a,(select t1.sid,grade from sc t1,course c1,student s1 where c1.cid=t1.cid and s1.sid=t1.sid and cname = 'math') b where s.sid=a.sid and a.sid=b.sid and a.grade>b.grade;

    9.选修同一门课程时,女生比所有男生成绩都好的学生名单;

    select * from student s,sc t,student s1,sc t1 where s.sid=t.sid and s1.sid=t1.sid and s.sid=s1.sid and s.sex='f'and s1.sex='m' and

    t.cid=t1.cid and t.grade>t1.grade;

    10.至少选修两门及以上课程的学生姓名、性别;

    select sname,sex from student s,sc t where s.sid=t.sid having count(t.cid)>=2

    11.选修了sandy老师所讲课程的学生人数;

    select count(sid) from student s where sid in (select distinct sid from sc where cid in (select cid from course where

    teacher='sandy'));

    12.本校学生中有学生姓名/性别重复的同学,请编写脚本查出本校所有学生的信息,显示学号,姓名,性别,总成绩,对于姓名/性别重复的学生信息只取总成绩最高的那一条记录。

    select s.sid,sname,sex,sum(grade) from student s,sc t where s.sid=t.sid

    group by  s.sid,sname;

    13.“english”课程得最高分的学生姓名、性别、所在系;

    select sname,sex,department from student where sid = (select sid from sc where grade =(select max(grade) from sc where cid= (select cid

    from course where cname='english')));

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  • 原文地址:https://www.cnblogs.com/hole/p/11339881.html
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