Question

我有一个查询，我用来连接两个表（帖子，关系）来返回你关注的用户（r.status = 1）或朋友（r.status = 2）的帖子。但后来也省略了帖子隐私私密（p.privacy = 2）和当前关系（r.status = 1）的帖子。

这是我的问题：

$user_id= 1;

$posts_query= "
SELECT DISTINCT post_id, user_id, story, photo, link, collection_id, privacy, date, type
FROM posts p
JOIN relations r ON p.user_id = r.recipient
AND (r.sender = '".$user_id."')
AND NOT (r.status = 1 AND p.privacy = 2)  
ORDER BY p.post_id DESC;
";

现在这个查询的唯一问题是它省略了你自己的个人帖子。

对此的查询是：

$your_posts_query= "SELECT * FROM posts WHERE user_id= '".$user_id."' ORDER BY p.post_id    
DESC";

现在，这不允许我将所有帖子聚合在一起。你的，以及你朋友和你所关注的人的那些。

我怎样才能使我的第一个查询也包含我的第二个查询所做的事情？

Answer 1

$user_id= 1;

$posts_query= "
SELECT DISTINCT post_id, user_id, story, photo, link, collection_id, privacy, date, type
FROM posts p
JOIN relations r ON p.user_id = r.recipient
AND (r.sender = '".$user_id."' OR p.user_id= '".$user_id."')
AND NOT (r.status = 1 AND p.privacy = 2)  
ORDER BY p.post_id DESC;
";

Answer 2

将两者结合起来得到一个结果集

$posts_query= "
SELECT post_id, user_id, story, photo, link, collection_id, privacy, date, type  
FROM posts WHERE user_id= '".$user_id."' 
union 
SELECT DISTINCT post_id, user_id, story, photo, link, collection_id, privacy, date, type
FROM posts p
JOIN relations r ON p.user_id = r.recipient
AND (r.sender = '".$user_id."')
AND NOT (r.status = 1 AND p.privacy = 2)  
ORDER BY p.post_id DESC;
";

使用两个组合的MySQL查询

2 个答案: