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index for ilike operation

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To: pgsql-general General <pgsql-general@xxxxxxxxxxxxxx>
Subject: index for ilike operation
From: AI Rumman <rummandba@xxxxxxxxx>
Date: Tue, 8 Feb 2011 11:07:25 +0600

I found that in Postresql 9.0.3 documentation:

It is also possible to use B-tree indexes for ILIKE and ~*, but only if the pattern starts with non-alphabetic characters, i.e., characters that are not affected by upper/lower case conversion.

Can anyone please tell me how to configure that?

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