Re: Help with join syntax sought

From: "James B(dot) Byrne" <byrnejb(at)harte-lyne(dot)ca>
To: pgsql-general(at)postgresql(dot)org
Cc: "Andy Colson" <andy(at)squeakycode(dot)net>
Subject: Re: Help with join syntax sought
Date: 2009-05-20 17:07:56
Message-ID: 53717.216.185.71.24.1242839276.squirrel@webmail.harte-lyne.ca
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This seems to be working. I had to take a different approach as I
had misapprehended GROUP BY completely.

SELECT *
FROM currency_exchange_rates AS xchg1
WHERE id
IN (
SELECT id
FROM currency_exchange_rates as xchg2
WHERE
xchg1.currency_code_base = xchg2.currency_code_base
AND
xchg1.currency_code_quote = xchg2.currency_code_quote
ORDER BY currency_code_base,
currency_code_quote,
effective_from DESC
LIMIT 1 )
ORDER BY currency_code_base,
currency_code_quote,
effective_from DESC

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