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How to use an alias name in the current select

From: Guy Deleeuw <G(dot)De_Leeuw(at)eurofer(dot)be>
To: pgsql-admin(at)postgresql(dot)org
Subject: How to use an alias name in the current select
Date: 2010-03-24 16:42:10
Message-ID: (view raw or whole thread)
Lists: pgsql-admin

I have :
          t_orders_articles.k_id            AS k_id
         ,t_orders_articles.quantity        AS order_qty
         ,(SELECT sum(quantity) FROM t_deliveries_articles WHERE 
article_id = t_orders_articles.k_id) AS delivery_qty
         , (t_orders_articles.quantity - delivery_qty)       AS qty
       FROM t_orders_articles

But it's not working I receive the error :
ERROR : The column delivery_qty does not exist.

How can I make that without having 2 select call ?



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