|Subject||Re: [firebird-support] in vs exist|
> > Can anybody give me somes notes on uses of "IN" and "EXIST". How aretable"
> > they being use? Which is much preferred?
> > Thanks
> to quote Celko
> "An EXISTS predicate can use indexes to find.. or fail, whereas the IN
> predicate ofen has to build the results of the subquery in a working
>Celko is talking rubbish here. "can use indexes" -> this is implementation
> not sure exactly how FB is optimised in this regard
defined. How an engine handles whatever statement has nothing to do
with the logical operator "EXISTS" or "IN".
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