【数据库MySQL】练习---视图

步骤1：创建学生表stu，插入3条记录

#创建stu表
CREATE TABLE stu 
(
s_id INT PRIMARY KEY,
s_name VARCHAR(20),
addr VARCHAR(50),
tel VARCHAR(50)
); 

#stu表中插入数据
INSERT INTO stu
VALUES(1,'XiaoWang','Henan','0371-12345678'),
(2,'XiaoLi','Hebei','13889072345'),
(3,'XiaoTian','Henan','0371-12345670');

步骤2：创建报名表sign，插入3条记录

#创建sign表
CREATE TABLE sign 
(
s_id INT PRIMARY KEY,
s_name VARCHAR(20),
s_sch VARCHAR(50),
s_sign_sch VARCHAR(50)
); 

#表sign中插入数据
INSERT INTO sign 
VALUES(1,'XiaoWang','Middle School1','Peking University'),
(2,'XiaoLi','Middle School2','Tsinghua University'),
(3,'XiaoTian','Middle School3','Tsinghua University');

步骤3：创建成绩表stu_mark，插入3条记录

CREATE TABLE stu_mark (s_id INT PRIMARY KEY ,s_name VARCHAR(20) ,mark int ); 
INSERT INTO stu_mark VALUES(1,'XiaoWang',80),(2,'XiaoLi',71),(3,'XiaoTian',70);

步骤4：创建考上Peking University的学生的视图

create view Peki_stu(学号,姓名,成绩,大学) as
select a.s_id,a.s_name,mark,s_sign_sch from sign a  inner join stu_mark b  
on a.s_id=b.s_id 
where s_sign_sch='Peking University';

步骤5：创建考上Tsinghua University的学生的视图

create view Tsing_stu(学号,姓名,成绩,大学) as
select a.s_id,a.s_name,mark,s_sign_sch from sign a  inner join stu_mark b  
on a.s_id=b.s_id 
where s_sign_sch='Tsinghua University';

步骤6：XiaoTian的成绩在录入的时候录入错误多录了50分，对其录入成绩进行更正

update stu_mark 
set mark=mark-50
where stu_mark.s_name='XiaoTian';

步骤7：查看更新过后视图和表的情况

步骤8：查看视图的创建信息

#查看北大学生信息
mysql> show create view Peki_stu \G
*************************** 1. row ***************************
                View: Peki_stu
         Create View: CREATE ALGORITHM=UNDEFINED DEFINER=`skip-grants user`@`skip-grants host` SQL SECURITY DEFINER VIEW `Peki_stu` AS select `a`.`s_id` AS `学号`,`a`.`s_name` AS `姓名`,`b`.`mark` AS `成绩`,`a`.`s_sign_sch` AS `大学` from (`sign` `a` join `stu_mark` `b` on((`a`.`s_id` = `b`.`s_id`))) where (`a`.`s_sign_sch` = 'Peking University')
character_set_client: utf8
collation_connection: utf8_general_ci
1 row in set (0.00 sec)

#查看清华学生信息
mysql> show create view Tsing_stu \G
*************************** 1. row ***************************
                View: Tsing_stu
         Create View: CREATE ALGORITHM=UNDEFINED DEFINER=`skip-grants user`@`skip-grants host` SQL SECURITY DEFINER VIEW `Tsing_stu` AS select `a`.`s_id` AS `学号`,`a`.`s_name` AS `姓名`,`b`.`mark` AS `成绩`,`a`.`s_sign_sch` AS `大学` from (`sign` `a` join `stu_mark` `b` on((`a`.`s_id` = `b`.`s_id`))) where (`a`.`s_sign_sch` = 'Tsinghua University')
character_set_client: utf8
collation_connection: utf8_general_ci
1 row in set (0.00 sec)

步骤9：删除创建的视图

完成！！！

【数据库MySQL】练习---视图

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