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It seems that my Oracle can't do this. I found the if I put the empty table at the end of FROM clause, the query can speed up a lot of time.
fangliu_at_my-deja.com wrote:
> Hi, Norris:
> It depends on the optimizaiton stratagy. Most DBMSs have their own
> aptimizaiton algorithms, and they will re-order the join sequence when
> the sql is executed. So, you need not take care too much of this
> problem.
> Sent via Deja.com http://www.deja.com/
> Before you buy.
-- http://www.cooper.com.hkReceived on Tue Jun 13 2000 - 00:00:00 CDT