找不到logiq mysql請求SELECT ... IN

Question

我有一個帶有2個字段的「Posts_Tags」表。

post_id tag_id 
1   1 
1   4 
1   9 
2   1 
2   4 
2   7 
3   2 
3   4 

一表 「標籤」 用3種

tag_id type  name 
1   geoloc  Paris 
2   geloc  Rome 
3   geoloc  London 
4   paint  Abby 
5   paint  Martin 
6   paint  Dupont 
7   designer Paulo 
8   designer Stefy 
9   designer Michel 

我想獲得的POST_ID與一些​​tags_id。

我已經提出了一個簡單的請求，以獲得所有帖子ID與以下標籤：巴黎，羅馬。

$arrray_in = array(1, 2); //This array is generated and can contain all Tags Ids, this is example value, maybe can i 10 values or more... 
SELECT * FROM posts_tags WHERE tag_id IN($array_in) GROUP BY post_id 

我想只能通過以下標籤Paris（geoloc）和Abby（paint）獲得post_id。這個請求不給我好成績（返程POST_ID：1，2，3，我想只有POST_ID：1，2）

$arrray_in = array(1, 2); //This array is generated and can contain all Tags Ids, this is example value, maybe can i 10 values or more... 
    SELECT * FROM posts_tags WHERE tag_id IN($array_in) GROUP BY post_id 

Answer 1

您可以使用下面的方法獲取只有這些標籤的帖子：

SELECT pt.post_id 
FROM posts_tags pt 
WHERE pt.tag_id IN(1, 4) 
GROUP BY pt.post_id 
having count(distinct pt.tag_id) =2; 

請參閱SQL Fiddle with Demo。

如果要返回有關職位的詳細信息，那麼你canuse：

select * 
from posts_tags pt1 
inner join tags t 
    on pt1.tag_id = t.tag_id 
    and t.tag_id in (1, 4) 
where exists (SELECT pt.post_id 
       FROM posts_tags pt 
       WHERE pt.tag_id IN(1, 4) 
       and pt1.post_id = pt.post_id 
       GROUP BY post_id 
       having count(distinct pt.tag_id) =2); 

見SQL Fiddle with Demo