Re: using greater than or less than vs equals in where condition

Yes most of the data has type_code =2 probably 99.9%.

Thanks,
-Prasanth.

Tom Lane wrote:
> Prasanth <dbadmin@nqadmin.com> writes:
>
>>PG Version: 7.4.7
>
>
>>explain analyze select * from data where type_code >'2' AND type_code<'4';
>>[ is slow ]
>>explain analyze select * from data where type_code = '3';
>>[ isn't ]
>
>
> Are there a whole lot of rows with type_code = 2?  If so, this is
> fixed in 8.0.
>
> 2003-12-20 20:23  tgl
>
>     * src/: backend/access/nbtree/nbtinsert.c,
>     backend/access/nbtree/nbtpage.c, backend/access/nbtree/nbtsearch.c,
>     include/access/nbtree.h: Improve btree's
>     initial-positioning-strategy code so that we never need to step
>     more than one entry after descending the search tree to arrive at
>     the correct place to start the scan.  This can improve the behavior
>     substantially when there are many entries equal to the chosen
>     boundary value.  Per suggestion from Dmitry Tkach, 14-Jul-03.
>
>             regards, tom lane
>
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