CREATE ALGORITHM = UNDEFINED
DEFINER = `root`@`localhost`
SQL SECURITY DEFINER
VIEW girl_users_view AS
(SELECT g.id,g.age,g.size,g.city_type,g.`name`,u.username,u.nickname FROM users u INNER JOIN girl g ON g.id=u.id)
几点说明（MySQL中的视图在标准SQL的基础之上做了扩展）：
ALGORITHM=UNDEFINED：指定视图的处理算法；
DEFINER=`root`@`localhost`：指定视图创建者；
SQL SECURITY DEFINER：指定视图查询数据时的安全验证方式；
修改视图
ALTER ALGORITHM = UNDEFINED
DEFINER = `root`@`localhost`
SQL SECURITY DEFINER
VIEW girl_users_view AS
(SELECT g.age,g.size,g.city_type,g.`name`,u.username,u.nickname FROM users u INNER JOIN girl g ON g.id=u.id)