Re: Getting a grip on nested intervals and matrix encoding
Date: Sat, 21 Aug 2010 12:16:45 -0700 (PDT)
Sorry for delayed reply.
On Aug 16, 12:52 pm, Vadim Tropashko <vadim..._at_gmail.com> wrote:
> The records ordered by idx_left, idx_right desc. I assume you want a
> query that when given a node in a hierarchy fetches the next node
> according to the ordering. I found that this query is a mess due to
> composite ordering key. Therefore, it makes sense to order the values
> by a scalar, something like (a11-a12)/(a21-a22)*10000000000 - a11/a21
> Here is the full query:
> with OrderedHier as ( select name, (a11-a12)/(a21-a22)*10000000000 -
> a11/a21 pos from hierarchy )
> SELECT h.name FROM OrderedHier h, OrderedHier node
> where node.name = 'BLAKE'
> and h.pos > node.pos
> and not exists (
> SELECT * FROM OrderedHier hh
> where h.pos > hh.pos
> and hh.pos > node.pos
> fetching ALLEN. (Tested everything between KING and BLAKE)
Excellent! Seems to work great! Thank you so much!
creecode Received on Sat Aug 21 2010 - 21:16:45 CEST