Re: pgsql: Re-add item with better description: > * Allow ORDER BY ...

momjian@svr1.postgresql.org (Bruce Momjian) writes:
> Re-add item with better description:

>> * Allow ORDER BY ... LIMIT 1 to select high/low value without sort or
>> index using a sequential scan for highest/lowest values
>>
>> Right now, if no index exists, ORDER BY ... LIMIT 1 requires we sort
>> all values to return the high/low value.  Instead The idea is to do a
>> sequential scan to find the high/low value, thus avoiding the sort.

That's not much better, as it simply begs the question "why not use
MIN/MAX"?

I think the real point of Oleg's suggestion is a better way to do "top N"
queries.  This does not get interesting unless N > 1.

            regards, tom lane