any simple example of how to update one field1 in fileA from a different field2 in fileB -- MIDRANGE-L

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Subject: any simple example of how to update one field1 in fileA from a different field2 in fileB
From: "Stone, Joel" <Joel.Stone@xxxxxxxxxx>
Date: Wed, 30 Mar 2016 21:42:20 +0000
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When fileB has more than one key?

The following works when fileB has only one key. How can I do the same when fileB has two+ keys?

update fileA a
set a.field1 =
(select b.field2 from fileB b
where a.keyfield1 = b.keyfield1
where a.keyfield1 = (select keyfield1 from fileB b where a.keyfield1 = b.keyfield1)

Is there a simpler method - maybe using JOIN ON?

Thanks!

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Follow-Ups:

Re: any simple example of how to update one field1 in fileA from a different field2 in fileB , Charles Wilt
Re: any simple example of how to update one field1 in fileA from a different field2 in fileB , Glenn Gundermann

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