Re: About Div

On 7/25/06, Otniel Michael <otmic_ie(at)yahoo(dot)com> wrote:
>
> Dear All,
>
> I have a problem with this case :
>
> I have 10 candy for 7 child (A, B, C, D, E, F, G).
>
> Table X :
> code value
> ------- --------
> A 0
> B 0
> C 0
> D 0
> E 0
> F 0
> G 0
>
> And I want divide it with this algorithm :
> A = 10 / 7 = 1
> B = (10-1) / (7-1) = 9 / 6 = 1
> C = (10-2) / (7-2) = 8 / 5 = 1
> D = (10-3) / (7-3) = 7 / 4 = 1
> E = (10-4) / (7-4) = 6 / 3 = 2
> F = (10-6) / (7-5) = 4 / 2 = 2
> G = (10-8) / (7-6) = 2 / 2 = 2
>
> In my first solution i use loop - for each record in my function.
> But it is too slow in a lot of data.
> Did postgresql have a function for my case?
>

No loop necessary. This is a simple math problem:

dividedamount := candy / childcount;
extra = candy % childcount;

So the first (childcount - extra) get (dividedamount) pieces of candy and
the last (extra) get (dividedamount + 1) pieces of candy.

==================================================================
Aaron Bono
Aranya Software Technologies, Inc.
http://www.aranya.com
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