Numbering rows by date

From: "Andrus" <kobruleht2(at)hot(dot)ee>
To: pgsql-general(at)postgresql(dot)org
Subject: Numbering rows by date
Date: 2008-04-02 14:59:43
Message-ID: ft074l$46m$1@news.hub.org
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I have table

create Document ( docdate date, docorder integer )

I need update docorder column with numbers 1,2 in docdate date order
Something like

i = 1;
UPDATE Document SET docorder = i++
ORDER BY docdate;

How to do this is PostgreSQL 8.2 ?

Andrus.

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