MySQL视图表创建与修改

1、创建 CREATE [OR REPLACE] [lt;algorithm attributesgt;] VIEW [database.]lt; namegt; [(lt;columnsgt;)]AS lt;selec 1、创建CREATE [OR REPLACE] [] VIEW [database.] [()]AS []例子：CREATE VIEW `view_articles`ASSELECT 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.idORDER BY a.posttime DESC;修改ALTER [] VIEW [.] [()]AS []例子：ALTER VIEW `view_articles`ASSELECT 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.idORDER 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。，