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From: "Thomas F. O'Connell" <tfo@sitening.com>
Subject: Re: question
Date: Mon, 29 Aug 2005 15:10:48 -0500
To: Matt A. <survivedsushi@yahoo.com>

Matt,

In PostgreSQL 8.0.3, I see:

postgres=3D# select nullif( '1', '' );
nullif
--------
1
(1 row)

postgres=3D# select nullif( '', '' ) is null;
?column?
----------
t
(1 row)

What behavior are you expecting?

--
Thomas F. O'Connell
Co-Founder, Information Architect
Sitening, LLC

Strategic Open Source: Open Your i=99

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On Aug 24, 2005, at 12:05 AM, Matt A. wrote:

> I have a rating section on a website. It has radio
> buttons with values 1-5 according to the rating level.
> Lastly there is a null option for n/a. We use null for
> n/a so it's excluded from the AVG() calculations.
>
> We used nullif('$value','') on inserts in mssql.  We
> moved to postgres and love it but the nullif() doesn't
> match empty strings to each other to return null other
> than a text type, causing an error. This is a major
> part of our application.
>
> AKA nullif('1','') would insert 1 as integer even
> though wrapped in ''. Also nullif('','') would
> evaluate NULL and insert the "not a value"
> accordingly.
>
> Is there a workaround for this so it doesn't break our
> rating system? We cannot always enter a value for a
> integer column. Is there any other way to accomplish
> this? Please help.
>
>
>
>
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