MySQL第十一作业-视图的应用

 

create table lingjinzheng_stu(
s_id int(11) primary key not null unique,
s_name varchar(20) not null,
addr varchar(50) not null,
tel varchar(50) not null
);

 

 

create table lingjinzheng_sign(
s_id int(11) primary key not null unique,
s_name varchar(20) not null,
s_sch varchar(50) not null,
s_sign_sch varchar(50) not null
);

 

create table lingjinzheng_stu_mark(
s_id int(11) primary key not null unique,
s_name varchar(20) not null,
mark int(11) not null
); 

 

 

insert into lingjinzheng_stu values
(“1”,“ZhangPeng”,“Hebei”,“13889075861”),
(“2”,“LiXiao”,“Shandong”,“13953508223”),
(“3”,“HuangYun”,“Shandong”,“13905350996”);

 

 

insert into lingjinzheng_sign values
(“1”,“ZhangPeng”,“Hign School1”,“Peking University”),
(“2”,“LiXiao”,“Hign School2”,“Peking University”),
(“3”,“HuangYun”,“Hign School3”,“Tsinghua University”);

 

 insert intolingjinzgheng_stu_mark values
(“1”,“ZhangPeng”,“730”),
(“2”,“LiXiao”,“725”),
(“3”,“HuangYun”,“736”);

 

create view lingjinzheng_baida(id,name,mark,sch)as
select m.s_id,m.s_name,m.mark,s.s_sign_sch
from lingjingzheng_stu_mark mlingjinzheng_sign s
where m.s_id=s.s_id and m.mark>=720 and s.s_sign_sch=“Peking University”;

 

create view lingjinzheng_qinghua(id,name,mark,sch)as
select m.s_id,m.s_name,m.mark,s.s_sign_sch
from lingjinzheng_stu_mark m,zhongzheng_sign s
where m.s_id=s.s_id and m.mark>=725 and s.s_sign_sch=“Peking University”;

select * fromlingjingzheng_qinghua; 

 

 

update lingjinzheng_stu_mark set mark=mark-10
where lingjingzheng_stu_mark.s_name=“HuangYun”;