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help / color / mirror / Atom feedFrom: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Gary Stainburn <gary.stainburn@ringways.co.uk>
Cc: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: Re: Advice - indexing on varchar fields where only last x characters known
Date: Thu, 17 Oct 2013 15:39:02 -0300
Message-ID: <20131017183902.GA4943@eldon.alvh.no-ip.org> (raw)
In-Reply-To: <201310171220.44550.gary.stainburn@ringways.co.uk>
References: <201310171220.44550.gary.stainburn@ringways.co.uk>
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Gary Stainburn wrote:
> The problem that I have is that these VIN numbers are provided by a number of
> data systems including manufacturer feeds, logistics companies as well as
> internal systems. Some use the full 17 character string while others only use
> the last 11.
>
> On top of this, my users are used to only having to type the last 6 characters
> for speed and usability reasons.
Try creating an index on reverse(vin) and using the same function in
queries; you can put a % at the end of the sought-for literal to match
suffixes. That works quite well and is very simple to implement.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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To: pgsql-sql@postgresql.org
Cc: alvherre@2ndquadrant.com, gary.stainburn@ringways.co.uk
Subject: Re: Advice - indexing on varchar fields where only last x characters known
In-Reply-To: <20131017183902.GA4943@eldon.alvh.no-ip.org>
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