Ismail Kizir wrote:
> Hi everybody,
>
> 1 .... EXPLAIN SELECT COUNT(*) AS c FROM articletbl WHERE
> ((mydate BETWEEN '2004-04-24' AND '2004-05-24' )
> )
>
> 2 .... EXPLAIN SELECT COUNT(*) AS c FROM articletbl WHERE
> ((mydate = '2004-04-24')
> )
>
> (I ran VACUUM ANALYZE before running those)
>
> mydate is an indexed date column.
> The optimizer optimizes the second query but, it doesn't optimize the first
> one and decides to make a "sequential scan".
> Is this a bug?
> Or may someone explain me the reason?
give us the result of these queries:
SELECT COUNT(*) FROM articletbl;
SELECT COUNT(*) AS c FROM articletbl WHERE
mydate BETWEEN '2004-04-24' AND '2004-05-24';
SELECT COUNT(*) AS c FROM articletbl WHERE
mydate = '2004-04-24';
Regards
Gaetano Mendola