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help / color / mirror / Atom feedFrom: skinner@britvault.co.uk
To: pgsql-sql@postgresql.org
Subject: Re: Advice - indexing on varchar fields where only last x characters known
Date: Thu, 17 Oct 2013 12:45:12 +0100
Message-ID: <20131017114512.GA24563@teak.britvault.co.uk> (raw)
In-Reply-To: <201310171220.44550.gary.stainburn@ringways.co.uk>
References: <201310171220.44550.gary.stainburn@ringways.co.uk>
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On 2013-10-17 Thu 12:20 PM |, 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.
>
Split the vin into 2/3 columns?
vin_prefix (NULL), vin_suffix (NOT NULL)
vin_prefix, vin_centre, vin_suffix
UNIQUE all together in 1 constraint & index each separately.
Maybe...
--
Craig Skinner | http://twitter.com/Craig_Skinner | http://linkd.in/yGqkv7
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To: pgsql-sql@postgresql.org
Cc: skinner@britvault.co.uk
Subject: Re: Advice - indexing on varchar fields where only last x characters known
In-Reply-To: <20131017114512.GA24563@teak.britvault.co.uk>
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