How can I group all children by their parent ?

From: Arup Rakshit <aruprakshit(at)rocketmail(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: How can I group all children by their parent ?
Date: 2014-07-17 13:08:51
Message-ID: 1405602531.72224.YahooMailNeo@web193903.mail.sg3.yahoo.com
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How can I group all children by their parent ? 

id email parent_id
1 test(at)test(dot)com nil
2 test1(at)test(dot)com 1
3 email 1
4 email 2
5 email nil
6 email 3
 
Regards,
Arup Rakshit

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