Re: UPSERT

On Sun, Mar 04, 2007 at 14:55:47 +0200, Hannu Krosing <hannu@skype.net> wrote:
> 
> UPDATE
> IF NOT FOUND THEN 
>   INSERT
>   IF DUPLICATE KEY THEN
>     UPDATE
>   END IF
> END IF

I believe it is possible for the above to fail. For example another
transaction could create a matching record between the update and insert
and then another transaction could delete it between the insert and the
second update.