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Hive, mail # user - how to join like a "In A but not in B" operation?


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Re:Re: how to join like a "In A but not in B" operation?
Richard 2012-03-12, 05:26

Hi Sachin

 
I have tried LEFT SEMI JOIN, but the results are the same to a JOIN operation.
 
Richard

 
At 2012-03-12 12:03:39,[EMAIL PROTECTED] wrote:
Hi richard,

You can use left semi join.

SELECT a.key.
FROM a LEFT SEMI JOIN b on (a.key = b.key)

Thanks,
Sachin
Sent from BlackBerry® on Airtel
From: Richard <[EMAIL PROTECTED]>
Date: Mon, 12 Mar 2012 11:52:11 +0800 (CST)
To: <[EMAIL PROTECTED]>
ReplyTo: [EMAIL PROTECTED]
Subject: how to join like a "In A but not in B" operation?
hi,
 
how can I join two tables A and B so that the result is "In A but not in B"?
 
let's take an example, say, the column to identify record is id.
e.g.
 
  select A.* from A join B on (A.id = B.id)
 
thanks.
Richard