MySQL 查询将结果按 GROUP BY 3 表计数排序

Question

I'm coding a listing system and I'm trying to get the posts ORDER by number of comments and votes FROM 2 tables.

Table1 : Lists => id, title, detail

Table2 : Votes => voteid, listid

Table3 : Comments => commentid, listid

WHERE MY Current query is

$q = mysql_query("SELECT * FROM zoo_leads 
LEFT JOIN Votes ON Lists.id=Votes.listid
LEFT JOIN Comments ON Lists.id=Comments.listid
GROUP BY Lists.id ORDER BY Comments.listid DESC LIMIT 10

it is showing me results perfectly but ORDER BY is Lists.id Instead of number of votes and comments

Answer 1

Try:

SELECT *
FROM   zoo_leads
       LEFT JOIN votes
         ON lists.id = votes.listid
       LEFT JOIN comments
         ON lists.id = comments.listid
GROUP  BY lists.id
ORDER  BY COUNT(votes.id) DESC,
          COUNT(comments.id) DESC
LIMIT  10  

Answer 2

That is because you have ORDER BY Comments.listid in your SQL statement.