Author: Stephen Russell
Posted: 2012-07-10 at 14:27:28
On Tue, Jul 10, 2012 at 1:25 PM, Gérard Lochon <g-lochon@wanadoo.fr> wrote:
> ----- Original Message -----
>
>>
>> Is there any value to know the location # from BOF(), and if there is
>> why is closer better depending on index?
>
> BOF() is an XBase iterative function, nothing to do witrh SQL ensembly
> conceipt.
> Somewhere, excluding it.
>
> However; it is always possible to replace this lack of logic.
>
> If we consider the previous example :
>
> [VFP]
>
> CREATE CURSOR test ;
> (lib c(10),mt i)
>
> INSERT INTO test VALUES ("john",10)
> INSERT INTO test VALUES ("jennifer",15)
> INSERT INTO test VALUES ("stella",25)
> INSERT INTO test VALUES ("sophia",40)
> INSERT INTO test VALUES ("greg",50)
> INSERT INTO test VALUES ("jeff",20)
>
> [/VFP]
>
> It is possible to "create a rank" according to a choosen order.
>
> Let's do it. We choose to order "mt" values :
>
>
> [VFP]
>
> SELECT xx.lib, xx.mt, COUNT(yy.mt) as rank ;
> FROM test xx, test yy ;
> WHERE xx.mt <= yy.mt ;
> GROUP BY xx.lib, xx.mt ;
> ORDER BY xx.mt DESC, xx.lib DESC
>
> [/VFP]
>
> Once upon this order is made, we can determine
> a numeric distance delta (your question) from
> BOF() or EOF().
>
---------------------
Does this handle the tie at the #2 rank properly for ranks 3,4&5?
--
Stephen Russell
Sr. Analyst
Ring Container Technology
Oakland TN
901.246-0159 cell
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