Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
Hive >> mail # user >> how to join like a "In A but not in B" operation?


Copy link to this message
-
Re:Re: how to join like a "In A but not in B" operation?

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
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB