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Date: Fri, 27 Mar 2015 18:14:50 +0000
From: Raymond O'Donnell <rod@iol.ie>
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To: Suresh Raja <suresh.rajaabc@gmail.com>, pgsql-general@postgresql.org,
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Subject: Re: check data for datatype
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On 27/03/2015 18:08, Suresh Raja wrote:
>     Hi All:
> 
> 
> I have a very large table and the column type is text.  I would like to
> convert in numeric.  How can I find rows that dont have numbers.  I
> would like to delete those rows.

Use a regular expression:

  select <whatever> from <the table> where <the column> ~ <regexp>

http://www.postgresql.org/docs/9.4/static/functions-matching.html#FUNCTIONS-POSIX-REGEXP

HTH,

Ray.

-- 
Raymond O'Donnell :: Galway :: Ireland
rod@iol.ie


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