本文介绍了mySQL INNER JOIN和UNION ALL一起的处理方法,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
我有一个表,其中如果日期和类别"bar"匹配则对行进行分组,现在我需要对其他表进行 INNER JOIN 并使用 WHERE answer ='2'从该表开始,但我不知道该怎么做.
I have a table with rows that's grouped if the date and the category 'bar' matches, now I need to INNER JOIN these with another table and use a WHERE answer = '2' from that table, but I don't know how to do that.
SELECT category, date, client FROM sbs_events WHERE category <> 'bar' UNION ALL SELECT category, date, MIN(client) AS client FROM sbs_events WHERE category = 'bar' GROUP BY category, date我制作了 SQL小提琴
我需要添加到小提琴中的东西是
The thing I need to add to the fiddle is
INNER JOIN sbs_userEvents ON sbs_events.id = sbs_userEvents.event_id WHERE answer = 2 AND user_id = 1但是由于我已经有一个 WHERE category ='bar',所以我不知道如何添加它.
But since I already have a WHERE category = 'bar' I don't know how to add this.
推荐答案SELECT category, date, client FROM sbs_events INNER JOIN sbs_userEvents ON sbs_events.id = sbs_userEvents.event_id WHERE category <> 'bar' AND answer = 2 AND user_id = 1 UNION ALL SELECT category, date, MIN(client) AS client FROM sbs_events INNER JOIN sbs_userEvents ON sbs_events.id = sbs_userEvents.event_id WHERE category = 'bar' AND answer = 2 AND user_id = 1 GROUP BY category, date
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mySQL INNER JOIN和UNION ALL一起
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