SQL查询+限制+统计一个查询的总体结果？

Question

SELECT topics.* 
FROM topics topics 
    JOIN rh_topictags tt ON tt.topic_id = topics.topic_id 
    JOIN rh_topictags_tag t ON tt.tag_id = t.id 
    JOIN forums f ON f.forum_id = topics.forum_id 
WHERE LOWER(t.tag) IN ('super', 'fun') 
    AND f.rh_topictags_enabled = 1 
    AND topics.forum_id IN (1, 2, 3, 4) 
    AND topics.topic_visibility = 1 
GROUP BY topics.topic_id 
HAVING count(t.id) = 2 
ORDER BY topics.topic_last_post_time DESC 
LIMIT 0, 10 

如何获得整体找到的行数（没有限制）？

我可以不是使用SELECT FOUND_ROWS()因为这个查询必须在几个DBMS（mysql，mssql，oracle，postgres，sqlite，sqlite3）下运行。

不幸的是，这并不工作：

SELECT topics.*, COUNT(topics.*) AS result_count 
FROM topics topics 
    JOIN rh_topictags tt ON tt.topic_id = topics.topic_id 
    JOIN rh_topictags_tag t ON tt.tag_id = t.id 
    JOIN forums f ON f.forum_id = topics.forum_id 
WHERE LOWER(t.tag) IN ('super', 'fun') 
    AND f.rh_topictags_enabled = 1 
    AND topics.forum_id IN (1, 2, 3, 4) 
    AND topics.topic_visibility = 1 
GROUP BY topics.topic_id 
HAVING count(t.id) = 2 
ORDER BY topics.topic_last_post_time DESC 
LIMIT 0, 10 

Answer 1

这个怎么样：

Select * 
from 
( 
    SELECT topics.*, count(*) as result_count 
    FROM topics topics 
     JOIN rh_topictags tt ON tt.topic_id = topics.topic_id 
     JOIN rh_topictags_tag t ON tt.tag_id = t.id 
     JOIN forums f ON f.forum_id = topics.forum_id 
    WHERE LOWER(t.tag) IN ('super', 'fun') 
     AND f.rh_topictags_enabled = 1 
     AND topics.forum_id IN (1, 2, 3, 4) 
     AND topics.topic_visibility = 1 
    GROUP BY topics.topic_id 
    HAVING count(t.id) = 2 
) a 
ORDER BY a.topic_last_post_time DESC 
LIMIT 0, 10