Two table left join with 4 keys

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JFz
JFz 2017-5-23
评论： Peter Perkins 2017-5-23
Hi,
I have two tables, A and B, each has 7 columns and 4 keys. I would like to left join by the 4 keys and show the rest 3 columns of both table into a new table, with only one set of the keys.
The purpose is to compare the two tables.
How to do that?
Thanks,
Jennifer
  2 个评论
Rik
Rik 2017-5-23
What have you tried? I don't fully understand what it is exactly that you want to do, but it sounds like you will benefit from a look at the documentation for the table class and/or the unique function.
Peter Perkins
Peter Perkins 2017-5-23
Have you looked at the join, innerjoin, and outerjoin functions?

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