Re: indexes for ILIKE

We tried this recently. You have to use lower(a) like lower(b) for
the index to work.

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On Feb 13, 2006, at 5:42 AM, Martijn van Oosterhout wrote:

> On Mon, Feb 13, 2006 at 03:33:34PM +0300, Ilja Golshtein wrote:
>> Hello!
>>
>> Is there any way to use an index to pick up text field
>> start from a substring?
>> I need to ignore case of characters and encoding I use is UTF-8.
>>
>> I am aware of text_pattern_ops and stuff, though
>> FAQ says ILIKE does not use indexes.
>
> You at the very least would need a text_pattern_ops index on
> lower(colname). At that, I'm not sure whether it would work or whether
> you need to rephrase your query as:
>
> lower(a) like lower(b)
>
> Hope this helps,
> --
> Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/
> kleptog/
>> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent
>> is a
>> tool for doing 5% of the work and then sitting around waiting for
>> someone
>> else to do the other 95% so you can sue them.