1、创建CREATE [OR REPLACE] [<algorithm attributes>] VIEW [database.]< name> [(<columns>)]
AS <select statement> [<check options>]
例子:CREATE VIEW `view_articles`
AS
SELECT
a.id AS id,
a.title AS title,
a.content AS content,
t.name AS tagname,
u.firstname AS "username"
FROM `articles` a
LEFT JOIN `tags` t
ON a.tag_id = t.id
LEFT JOIN `users` u
ON a.user_id = u.id
ORDER BY a.posttime DESC;
修改ALTER [<algorithm attributes>] VIEW [<database>.]< name> [(<columns>)]
AS<select statement> [<check options>]
例子:
ALTER VIEW `view_articles`
AS
SELECT
a.id AS id,
a.title AS title,
a.content AS content,
a.posttime AS posttime,
t.name AS tagname,
CONCAT(u.firstname," ",u.lastname) AS "username"
FROM `articles` a
LEFT JOIN `tags` t
ON a.tag_id = t.id
LEFT JOIN `users` u
ON a.user_id = u.id
ORDER BY a.posttime DESC; 修改已经建立好的视图表,最简单的方法就是在phpMyAdmin导出视图表的SQL,然后修改开头的“CREATE”(后面的”ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER”等不用管,保留它)为”ALTER”,运行语句即可。MongoDB启动失败问题解决Oracle 10g 随Linux系统自动启动的设置脚本相关资讯 MySQL基础教程
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