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From: Sam Mason <sam@samason.me.uk>
To: pgsql-performance@postgresql.org
Subject: Re: tricky query
Date: Tue, 28 Jun 2005 16:42:42 +0100
Message-ID: <20050628154242.GS62747@colo.samason.me.uk> (raw)
In-Reply-To: <6EE64EF3AB31D5448D0007DD34EEB3415C2BEC@Herge.rcsinc.local>
References: <6EE64EF3AB31D5448D0007DD34EEB3415C2BEC@Herge.rcsinc.local>

Merlin Moncure wrote:
>I've already worked out a query using generate_series (not scalable) and
>pl/pgsql.  An SQL only solution would be preferred, am I missing
>something obvious?

I would be tempted to join the table to itself like:

  SELECT id+1
  FROM foo
  WHERE id > 0
    AND i NOT IN (SELECT id-1 FROM foo)
  LIMIT 1;

Seems to work for me.  Not sure if that's good enough for you, but
it may help.

  Sam

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