> Example assuming int index column:
> from to nrow_estimate
> 1 100 10005
> 101 20000 9997
> 20001 100000 10014
>
> badly scewed values (excluded in above table):
> val nrow_estimate
> 1 100000
> 5 1000000
>
> But imho this is an overkill, and seldom useful.
Yes, some commerical databases do this, though it is of questionable value.
-- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610)
853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill,
Pennsylvania19026
