Question

我有以下查询：

select * from winners 
join profiles on winners.subscriber_id = profiles.subscriber_id 
join comments on comments.profile_id = profiles.vanity
join videos on winners.subscriber_id = videos.subscriber_id
join photos on winners.subscriber_id = photos.subscriber_id
where winners.round_id >= 4 AND winners.active = true 
AND (comments.created_at > DATE_SUB( NOW(), INTERVAL 24 HOUR) OR videos.created_at > DATE_SUB( NOW(), INTERVAL 24 HOUR) OR photos.created_at > DATE_SUB( NOW(), INTERVAL 24 HOUR)) AND comments.parent_id = 0;

此查询在cron作业上运行，该作业将为每位获胜者提取过去24小时的最新信息，然后将向每位获奖者粉丝发送最新信息。

我遇到的问题是该查询正在撤回误报，因为如果在过去24小时内发生了对视频的评论，那么它会撤回视频和评论。 无论如何要限制在过去24小时内完成所有事情？

Answer 1

我会将24小时支票移至加入。这样我们只加入最近更新的项目。

select * from winners 
    join profiles on winners.subscriber_id = profiles.subscriber_id
    left join comments on (comments.profile_id = profiles.vanity AND comments.created_at > DATE_SUB( NOW(), INTERVAL 24 HOUR))
    left join videos on (winners.subscriber_id = videos.subscriber_id AND videos.created_at > DATE_SUB( NOW(), INTERVAL 24 HOUR))
    left join photos on (winners.subscriber_id = photos.subscriber_id AND photos.created_at > DATE_SUB( NOW(), INTERVAL 24 HOUR))
where winners.round_id >= 4 AND winners.active = true 
AND comments.parent_id = 0;

MySQL：24小时连接间隔

1 个答案: