MySQL：时间轴脚本，添加用户帖子和我自己的帖子

Question

我正在编写一个时间轴PHP脚本：

1. 搜索用户之间的所有关系
2. posts = relations.friend
时加入表posts.user
3. users = relations.friend
时加入表users.id

该脚本运行正常，并检索用户朋友发送的所有帖子。

SELECT relations.friend as uid, users.name, users.email, posts.id as pid, posts.text, posts.date
FROM `relations`
INNER JOIN `posts` ON relations.friend = posts.id
INNER JOIN `users` ON relations.friend = users.id
WHERE relations.user = 2

我需要在结果中添加用户自己的帖子，但我无法做到。我的表格如下：

帖子

----------------------------------------------------------
id      text            user        status      date
----------------------------------------------------------
1       Post 1          1           1           01-01-2014
2       Post 2          2           1           01-02-2014
3       Post 3          3           1           01-03-2014
4       Post 4          4           1           01-03-2014
5       Post 5          5           1           01-04-2014

关系

--------------------------------------------
id      user            friend      status
--------------------------------------------
1       1               2           1
2       2               1           1
3       2               3           1
4       3               2           1
5       3               1           1
6       4               1           1
7       5               1           1
8       2               4           1

用户

--------------------------------------------
id      name            email
--------------------------------------------
1       Adam            adam@mail.com
2       Bryan           bryan@mail.com
3       Mark            mark@mail.com
4       Yuri            yuri@mail.com
5       Andrew          andrew@mail.com

有什么想法吗？

Answer 1

Just UNION the results

SELECT relations.friend as uid, users.name, users.email, posts.id as pid, posts.text, posts.date
FROM `relations`
INNER JOIN `posts` ON relations.friend = posts.id
INNER JOIN `users` ON relations.friend = users.id
WHERE relations.user = 2

UNION

SELECT users.id as uid, users.name, users.email, posts.id as pid, posts.text, posts.date
FROM `users`
INNER JOIN `posts` ON posts.user = users.id
WHERE users.id = 2