Re: What does "merge-joinable join conditions" mean ????

From: "Dean Gibson (DB Administrator)" <postgresql4(at)ultimeth(dot)com>
To: pgsql-sql <pgsql-sql(at)postgresql(dot)org>
Subject: Re: What does "merge-joinable join conditions" mean ????
Date: 2006-01-15 22:28:08
Message-ID: 43CACC78.7090107@ultimeth.com
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On 2006-01-15 13:54, Michael Fuhr wrote:
> What's the query?
>

SELECT count(*) FROM "GenAppExtra" FULL JOIN "GeoRestrict" ON callsign
~ pattern WHERE region_id = 4 OR geo_region = 4;

If either of the "region_id = 4" (a field in the right-hand table) or
"geo_region = 4" (a field in the left-hand table) are removed, the
SELECT functions (does not give an error message), as does the case
where the "callsign ~ pattern" (one field is from each table) is
replaced by "callsign = pattern".

What's frustrating is that both tables are small, and "GeoRestrict" is
only about 15 rows.

At this point, I'm considering a UNION; alternate suggestions welcome!

-- Dean

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