从子查询选择中选择字段

本文介绍了从子查询选择中选择字段的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有这个查询，只是从ad_media获取字段，但是我不知道如何选择子查询选择中的字段以及从左到ad_params any的字段确实可以帮助您

I have this query that getting the fields just from ad_media , but i can't figure out how to select also the fields that are in the subquery selection as well as the fields from the left join with ad_params any help thanks indeed

select ad_media.ad_media_id , ad_media.ad_id from ad_media where ad_media.ad_id in ( select action_states.ad_id from action_states where action_states.state = 'reg' and action_states.action_id = '1' and action_states.timestamp::date between '2018-04-17' and '2018-04-17' and action_states.ad_id in ( select ads.ad_id from ads where ads.category = '2010' and ads.name = 'joe' ) ) left join ad_params on ad_media.ad_id = ad_params.ad_id;

推荐答案

您可以尝试内部加入而不是子查询：

SELECT ad_media.ad_media_id, ad_media.ad_id FROM ad_media INNER JOIN action_states ON action_states.ad_id = ad_media.ad_id INNER JOIN ads ON ads.ad_id = action_states.ad_id LEFT JOIN ad_params ON ad_media.ad_id = ad_params.ad_id WHERE action_states.state = 'reg' AND action_states.action_id = '1' AND action_states.timestamp::DATE BETWEEN '2018-04-17' AND '2018-04-17' AND ads.category = '2010' AND ads.name = 'joe';