can not use the column after rename

From: salah jubeh <s_jubeh(at)yahoo(dot)com>
To: pgsql <pgsql-general(at)postgresql(dot)org>
Subject: can not use the column after rename
Date: 2011-12-21 11:39:03
Message-ID: 1324467543.44390.YahooMailNeo@web161506.mail.bf1.yahoo.com
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Hello,

Why I can not do something like this in Postgres.

 SELECT 1 as a , 2 as b , a + b as c ;

Regards

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