Can you use some value (like "unknown") to represent NULL ? NULL is not equal to anything, including NULL:
https://stackoverflow.com/questions/1843451/why-does-null-null-evaluate-to-false-in-sql-server Best regards, Shaofeng Shi 史少锋 Apache Kylin PMC Work email: shaofeng....@kyligence.io Kyligence Inc: https://kyligence.io/ Apache Kylin FAQ: https://kylin.apache.org/docs/gettingstarted/faq.html Join Kylin user mail group: user-subscr...@kylin.apache.org Join Kylin dev mail group: dev-subscr...@kylin.apache.org Na Zhai <na.z...@kyligence.io> 于2019年2月17日周日 下午8:58写道： > Hi, chen > > I can not see your picture, you can try to add these in the attachment. > Does it have any error message? Maybe you can try to change null to another > word, like “unknown”. > > Best wishes! > > 发送自 Windows 10 版邮件<https://go.microsoft.com/fwlink/?LinkId=550986>应用 > > ________________________________ > 发件人: chen snowlake <jei...@outlook.com> > 发送时间: Thursday, February 14, 2019 6:07:01 PM > 收件人: dev@kylin.apache.org > 主题: [kylin] left join怎样join is null记录 > > HI： > 大家好，在join的时候，我的联合的条件数据中存在is null记录，他们不能join起来 > 请问kylin是怎么写这样的查询？ 不胜感激 > 比如 > [cid:image003.png@01D4C490.0483D3B0] > > … left Join … on ((a.region = a0.region) or (a.region is null and > a0.region is null )) 这样的条件并不能将 nul行join起来 > > [cid:image006.png@01D4C490.0483D3B0] > SnowLake > Email：che...@outlook.com > >
