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Entering '<1' and 'BDL'

From: Rich Shepard <rshepard(at)appl-ecosys(dot)com>
To: pdxpug(at)postgresql(dot)org
Subject: Entering '<1' and 'BDL'
Date: 2010-04-19 23:12:06
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Lists: pdxpug
   For a scientific database holding observed and measured values there are
two non-numeric (NAN) legitimate entries: <1 and 'below detection limits.'
Is anyone aware of a standard way of expressing these?

   The problem is that the column needs to be of a numeric type because the
numbers will be manipulated mathematically and summarized statistically. So
a NAN such as '<1' or 'BDL' doesn't cut it.

   Any thoughts?


Richard B. Shepard, Ph.D.               |  Integrity            Credibility
Applied Ecosystem Services, Inc.        |            Innovation
<>     Voice: 503-667-4517      Fax: 503-667-8863


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Subject: Re: Entering '<1' and 'BDL' -- RESOLVED
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