On 31 Dec 2006, at 09:25, Matt LeBlanc wrote:
This would be because MySQL tends to suck the more you join. In most
other databases, joins tend to be much quicker with slower subqueries.
Actually, databases with a decent optimiser will tend to unroll
subqueries and the execution plan will be equivalent to the join.
Certainly Pg's will do this in many cases.
More pertinently, I suspect the join cond you want isn't currently
achievable with DBIx::Class whereas aristotle's approach is, so I'd
suggest going with his approach and if it turns out to be a major
performance issue perhaps we can discuss what changes need to be made
and how the syntax would need to be extended in order to support yours?
--
Matt S Trout, Technical Director, Shadowcat Systems Ltd.
Offering custom development, consultancy and support contracts for
Catalyst,
DBIx::Class and BAST. Contact mst (at) shadowcatsystems.co.uk for
details.
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