Re: SQL SELECT question

In article <01bd3329$e899a120$8a0873c6_at_RATBERT.nl.stratus.com>, J. Cone <the_cone_at_g8labs.com> wrote:
>My experience in Oracle 6 is that it made a significant difference,
>because the last table was a full table scan or range scan and
>everything after that was a set of exact index lookups.
>It's probably still like that in Oracle 7 with the rule based optimizer.

I seem to recall some of the rules reversed going from 6 to 7, but it's been a loooong time... maybe it was 5 to 6... :)

>
>TurkBear <johng_at_mm.com> wrote in article
><34d757f7.84688916_at_news2.mm.com>...
>> My understanding is that Oracle reads from last to first in the where
>> clause -- however the optimizer my change that... I usually place the
>> most restrictive where clause ( that is the one that reduces the
>> potential eligible rows the most) as the last where statement, but I
>> am not sure that this actually improves things to any measurable
>> degree.
>>
>> Just my opinion
>>
>> John Greco
>> Oracle DBA
>>
>>

-- 
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