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Re: IS NULL seems to return false, even when parameter is NULL

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To: "Andrus" <kobruleht2@xxxxxx>
Subject: Re: IS NULL seems to return false, even when parameter is NULL
From: Tom Lane <tgl@xxxxxxxxxxxxx>
Date: Mon, 20 Oct 2008 08:34:32 -0400
Cc: pgsql-general@xxxxxxxxxxxxxx
Comments: In-reply-to "Andrus" <kobruleht2@xxxxxx> message dated "Mon, 20 Oct 2008 13:26:57 +0300"
In-reply-to: <9F9CF36A18A14D05BB4E048F2EDFB515@andrusnotebook>

"Andrus" <kobruleht2@xxxxxx> writes:
> PostgreSQL OR is not commutative if left operand evaluates to NULL.

This is nonsense.

			regards, tom lane

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References:
- IS NULL seems to return false, even when parameter is NULL
  - From: Lucazeo
- Re: IS NULL seems to return false, even when parameter is NULL
  - From: Andrus

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