Ladislav Lenart <lenart...@volny.cz> writes:
> What happens if I issue UPDATE SET FROM... but with incomplete/buggy WHERE
> condition and thus SEVERAL rows from the from_list match ONE row to update?
Any given row will be updated at most once. However, the from_list row
it gets updated against will be unpredictable, depending on the
implementation of the join.
regards, tom lane
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