Message-ID: <003601c42ec7$e7806ee0$8401a8c0@home.axiontech.com>
From: "Yudie" <yudie@axiontech.com>
To: <pgsql-sql@postgresql.org>
References: <20040430141145.40776.qmail@web20809.mail.yahoo.com>
Subject: Re: isnumeric() function?
Date: Fri, 30 Apr 2004 10:29:16 -0500
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Great the function works, but what does it means?
SELECT $1 ~ ''^[0-9]+$''

Yudie 

----- Original Message ----- 
From: "Jeff Eckermann" <jeff_eckermann@yahoo.com>
To: "Yudie" <yudie@axiontech.com>; <pgsql-sql@postgresql.org>
Sent: Friday, April 30, 2004 9:11 AM
Subject: Re: [SQL] isnumeric() function?


--- Yudie <yudie@axiontech.com> wrote:
> What is isnumeric function in postgresql? 
> I'm using psql version 7.2.2
> thanks
> Yudie

I don't think that function is included as such.  But
you could do something like:

CREATE FUNCTION isnumeric(text) RETURNS boolean AS '
SELECT $1 ~ ''^[0-9]+$''
' LANGUAGE 'sql';

Note that you would need to create this function for
every parameter datatype that you would intend to use,
or else be prepared to cast your input datatype as
appropriate.

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