default select ordering

From: Matt Roberts <matt(at)runtime-collective(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: default select ordering
Date: 2004-10-01 15:41:52
Message-ID: Pine.LNX.4.58.0410011640460.7325@molly.runtime-collective.com
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Please accept my apologies if this is answered elsewhere in the archives
or docs but I have searched without luck.

I've always assumed that default ordering of selects are based on a first
in first out principle and that this remains true at the row level despite
edits to columns.

However I'm dealing with a case where this doesn't seem to hold true. The
ordering has changed over time. Its difficult for me to gauge whether the
data has been moved around with pg_dump or whether optimisation/vacuum
commands have been called but I'm wondering if either of these things
could effect the first in first out ordering and if there's any system
tables or configerations that I can use to either verify or prevent this.

Any help greaty appreciated.

Matt Roberts

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