Re: swap relations to be able to execute a left join

On Fri, Dec 09, 2005 at 09:16:15AM -0800, David Rio Deiros wrote:

> The other day, a coworker who loves mysql was complaining to me because
> he had a hard time to find out why this query didn't work on PostgreSQL:
...
> FROM
> Artifact_Revisions AR,
> Revisions_to_Types RTT,
> Artifact_Types AT
> LEFT JOIN
> Users U
> on (U.user_id = AR.principal_user_id)
...
> Apparently, once he swapped the 1st (AR) and the 3rd (AT) relation in
> the FROM, the query worked.
...
> I am sure there is a good reason why you have to swap the relations
> in PostgreSQL. Anyone?

I should think his query is joining something other than
what he *thinks* it does...

Karsten
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