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From: Rodrigo De León <rdeleonp@gmail.com>
To: Franklin Haut <franklin.haut@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: SQL state: 22P02
Date: Thu, 22 Nov 2007 11:06:25 -0500
Message-ID: <a55915760711220806gb77d638wc68cb853e8c3013@mail.gmail.com> (raw)
In-Reply-To: <4745AD44.1@gmail.com>
References: <4745AD44.1@gmail.com>

On Nov 22, 2007 11:24 AM, Franklin Haut <franklin.haut@gmail.com> wrote:
>    num      return
>    ----     ------
>    0         0
>    null      false
>    12        12
>    a         false
>    12ab      false
>
>  it´s possible get these results ?

Try:

SELECT
    NUM
  , CASE
      WHEN TRIM(NUM) ~ '^[0-9]+(.[0-9]+){0,1}$'
      THEN NUM
      ELSE 'false'
    END AS RETURN
FROM TEST;

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  Subject: Re: SQL state: 22P02
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