Question

here it is

SELECT tbl_rls . * , (

SELECT count( * )
FROM `comments`
WHERE `post_id` = `tbl_rls`.`id`
) AS `t_comments`
FROM `tbl_rls`
WHERE 1 =1
AND `status` <> 'denied'
AND (
`id`
IN (

SELECT `rls_id`
FROM `tbl_visitors_logs`
WHERE `date` LIKE '2010-07-02%'
AND `page_type` = 'post'
GROUP BY `rls_id`
ORDER BY count( * ) DESC
)
)
AND (
`cat` = '6'
OR `cat`
IN (

SELECT `id`
FROM `tbl_cats`
WHERE `parent_id` = '6'
)
)
ORDER BY `tbl_rls`.`date` DESC
LIMIT 0 , 20

This is almost killing DB when executing , can some suggest solution to make it speedy ?

I am here to provide any additional info needed.

Thanks.

Answer 1

Here’s my re-write of your query:

   SELECT t. *, 
          x.t_comments
     FROM tbl_rls t
LEFT JOIN (SELECT c.post_id,
                  COUNT(*) AS t_comments
             FROM COMMENTS c
         GROUP BY t.post_id) x ON x.post_id = t.id
     JOIN tbl_visitors_logs tvl ON tvl.rls_id = t.id
                               AND tvl.date LIKE '2010-07-02%'
                               AND tvl.page_type = 'post'
    WHERE t.status != 'denied'
      AND (t.cat = '6' OR t.cat IN (SELECT `id`
                                      FROM `tbl_cats`
                                     WHERE `parent_id` = '6'))
ORDER BY t.`date` DESC
   LIMIT 0, 20