このクエリの実行中:
SELECT
a.id,
pub.name AS publisher_name,
pc.name AS placement_name,
b.name AS banner_name,
a.lead_id,
a.partner_id,
a.type,
l.status,
s.correctness,
a.landing_page,
t.name AS tracker_name,
a.date_view,
a.date_action
FROM actions AS a
LEFT JOIN publishers AS pub ON a.publisher_id = pub.id
LEFT JOIN placements AS pc ON pc.publisher_id = pub.id
LEFT JOIN banners AS b ON b.campaign_id = a.campaign_id
LEFT JOIN leads l ON
l.lead_id = a.lead_id
AND l.created = (
SELECT MAX(created) from leads l2 where l2.lead_id = l.lead_id
)
LEFT JOIN statuses AS s ON l.status = s.status
LEFT JOIN trackers AS t ON t.id = a.tracker_id
LIMIT 10
テーブルのすべての列で並べ替えることができactions
ます。ただし、たとえばORDER BY b.name
(banners
テーブルから、 で結合actions.banner_id
) またはORDER BY l.lead_id
(leads
上記のより複雑な条件で結合) しようとすると、MySQL は非常に長い時間クエリを実行しています (ほとんどのテーブルには数万のレコードがあります)。結合された列でソートすることは可能ですか?