(new.value != old.value) or (new.value IS NULL) or (old.value IS NULL)

-----Urspr√ľngliche Nachricht-----
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im 
Auftrag von Daniel Polski
Gesendet: Donnerstag, 13. Oktober 2016 12:03
An: SQLite mailing list <sqlite-users@mailinglists.sqlite.org>
Betreff: Re: [sqlite] Trigger WHEN condition, comparing with null

Thank you, I see.
Any suggestion how to get the trigger to fire if (and only if) the values are 
different, including if one of the "sides" of old/new are null?

Den 2016-10-13 kl. 11:56, skrev Kees Nuyt:
> On Thu, 13 Oct 2016 11:45:14 +0200, Daniel Polski
> <dan...@agelektronik.se> wrote:
>
> That's because the expression in the WHEN clause
>       (new.value != old.value)
> is not valid when one of them is NULL.
>
> HTH
>

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