Sorry, I take back my gordian knot, I found it in my own brains ;-(
For a <=, <, >=, > a lexical ordering would be more intuitive,
since that is how a compound index would sort.

so (a, b) <= (c, d) would resolve to:
(a <= c) or ((a = c) and (b <= c))

What happens to !=~ ? Should also be _OR_ ed.
I guess that leaves us at a point of no go. Take it out ? *tear drops
falling*

Andreas

> Vectors cannot be strictly ordered.  "Partial orderings" are possible.

I think it should say: an order has to be defined (lexical, vector lenght,
area size ..... )

> 
> Let A be (1, 2)
> Let B be (4, 7)
> Let C be (3, 5)
> Let D be (5, 10)
> 
> A is smallest; D is largest; how do B and C relate?

Tue, 17 Feb 1998 10:34:37 +0100
Zeugswetter Andreas SARZ <Andreas.Zeugswetter@telecom.at>
Re: Subselects open issue Nr. NEW