Archive Heavy Query (no replies)

Hi all,
I've several queries like this that invalidates the usage of partitionig by month. Is this correct?
(Why compare with last hour of the last month? Bug?)

log_visit.visit_last_action_time >= '2014-09-30 23:00:00'
AND log_visit.visit_last_action_time <= '2014-10-31 23:59:59'

Instead I'ts possible to have a query like this?

log_visit.visit_last_action_time>= '2014-10-01'
AND log_visit.visit_last_action_time < '2014-10-01' + INTERVAL 1 MONTH

Thank you

Regards
Jorge M.
-----
SELECT
count(distinct log_inner.idvisitor) AS `1`,
count(distinct log_inner.user_id) AS `39`
FROM
(
SELECT
log_visit.idvisitor,
log_visit.user_id
FROM
log_visit AS log_visit
LEFT JOIN log_link_visit_action AS log_link_visit_action ON log_link_visit_action.idvisit = log_visit.idvisit
WHERE
( log_visit.visit_last_action_time >= '2014-09-30 23:00:00'
AND log_visit.visit_last_action_time <= '2014-10-31 23:59:59'
AND log_visit.idsite IN ('9') )
AND
( ( log_link_visit_action.idaction_url IN (SELECT idaction FROM log_action WHERE ( name LIKE CONCAT('%', 'site/life/', '%') AND type = 1 )) ) )
GROUP BY log_visit.idvisit
) AS log_inner