2012/12/21 Tom Lane <tgl@sss.pgh.pa.us>:
> Christopher Browne <cbbrowne@gmail.com> writes:
>> This is adding specific syntax for what seems like an unusual case to me,
>> which seems like an unworthwhile complication.
>
> That was my first reaction too, but Marko's followon examples seem to
> make a reasonable case for it. There are many situations where you
> expect an UPDATE or DELETE to hit exactly one row. Often, programmers
> won't bother to add code to check that it did ... but if a one-word
> addition to the command can provide such a check, it seems more likely
> that they would add the check.
and it can be used for optimization - it can be optimized for fast first row
Regards
Pavel
>
> regards, tom lane
>
>
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