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From: David G. Johnston <[email protected]>
To: Thiemo Kellner <[email protected]>
Cc: [email protected]
Subject: Re: How do I check for NULL
Date: Tue, 9 Dec 2025 10:29:17 -0700
Message-ID: <CAKFQuwbnevkxuH8JUj4cRr8ABCAwhQTT7zM4kR0X_Le3tm7KMA@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CA+FnnTw=18Rba2XgceRUFKQo5P7Xf9QhXT6wKF=DgzYT6K9-sw@mail.gmail.com>
	<[email protected]>

On Tue, Dec 9, 2025 at 10:14 AM Thiemo Kellner <[email protected]>
wrote:

> I feel, you meant to say, the subquery does not return any record which is
> not the same as returns NULL.
>

For a scalar subquery the final output of a zero-row query is the null
value.

David J.

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