At 11:20 AM 12/6/2008, [EMAIL PROTECTED] wrote:
Message-ID: <[EMAIL PROTECTED]>
From: "Oliveiros Cristina" <[EMAIL PROTECTED]>
To: "Bryce Nesbitt" <[EMAIL PROTECTED]>,
"sql pgsql" <pgsql-sql@postgresql.org>
References: <[EMAIL PROTECTED]>
Subject: Re: Best way to "and" from a one-to-many joined table?
Date: Fri, 5 Dec 2008 19:23:25 -0000
Howdy, Bryce
Could you please try this out and tell me if it gave what you want.
Best,
Oliveiros
SELECT person_name
FROM test_people p
JOIN test_attributes a
ON ((a.people_id = p.people_id) AND (a."attribute" = @firstAttr))
JOIN test_attributes b
ON ((b."people_id" = p."people_id") AND (b."attribute" =
@secondAttr));
Hi,
I saw a few people post answers to this question and it raised another
related question for me.
What are the differences between the above query and this one. Are they
semantically/functionally identical but might differ in performance? Or
would they be optimized down to an identical query? Or am I misreading
them and they are actually different?
SELECT person_name
FROM test_people p
JOIN test_attributes a
ON ((a.people_id = p.people_id)
JOIN test_attributes b
ON ((b."people_id" = p."people_id")
WHERE
(a."attribute" = @firstAttr))
AND (b."attribute" = @secondAttr));
Also, any suggestions about how to figure out this on my own without
bugging the list in the future would be great. Thanks for any insight!
Steve
p.s. I posting in the same thread, but if you think I should have
started a new thread let me know for the future.
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