Message-ID: <029201c3394b$dc63e310$2800a8c0@mars>
From: "Christopher Kings-Lynne" <chriskl@familyhealth.com.au>
To: <nolan@celery.tssi.com>,
	"The Hermit Hacker" <scrappy@postgresql.org>
Cc: "The Hermit Hacker" <scrappy@postgresql.org>,
	"Jan Wieck" <JanWieck@Yahoo.com>, "Bruce Momjian" <pgman@candle.pha.pa.us>,
	"Josh Berkus" <josh@agliodbs.com>, "Joe Conway" <mail@joeconway.com>,
	"\"\"\"Advocacy PostgreSQL\"\"\"" <pgsql-advocacy@postgresql.org>,
	"PostgreSQL-general" <pgsql-general@postgresql.org>
References: <20030623053352.1457.qmail@celery.tssi.com>
Subject: Re: [GENERAL] interesting PHP/MySQL thread
Date: Mon, 23 Jun 2003 13:54:07 +0800
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> Also, unlike PostgreSQL (at least in 7.3), if you define an index on
> the column, mysql appears to use it for LIKE queries.
>
>    "SELECT * FROM table WHERE field LIKE 'nolan%';"

Nonsense.  PostgreSQL indexes such a thing quite happily.  I've used that a
lot.

> is very fast in mysql but not in 7.3, and even non-anchored LIKE searches
> in mysql appear to be using the index.
>
>    "SELECT * FROM table WHERE field LIKE '%nolan%';"
>
> executes considerably faster with an index on field than without one.

Hmmm - that seems iffy to me - have they invented a new field of index
theory?

Chris