> On Mon, 2003-07-07 at 17:57, mallah@trade-india.com wrote:
>> Depending on ur original problem EXISTS or IN may be usable
>> EXISTS is efficient and IN can be used efficiently in 7.4 version of
>> postgresql
>
> Could be a solution?!
> The question is - how long could the IN be?
>
> I mean, if I write something like:
> SELECT * FROM table WHERE columnX IN ('a', 'b', 'c', 'd', 'e', ... );
> How long can the collection (list) within IN be? Also thousands of
> elements?
Well i DO NOT know the exact limit.
May be someone else can answer it accurately.
But you could produce the list within IN using a subselect
that again depends on the exact problem.
regds
Mallah.
>
> And what means efficient? Goes the DB only once through the table?
>
> Cheers, Markus
>
>
>
>
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