From: Aaron Bono <postgresql@aranya.com>
To: Otniel Michael <otmic_ie@yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: About Div
Date: Tue, 25 Jul 2006 10:00:35 -0500
Message-ID: <bf05e51c0607250800p44e98ce7uea04b19ff0cf8eee@mail.gmail.com> (raw)
In-Reply-To: <20060725075726.47735.qmail@web53211.mail.yahoo.com>
References: <20060725075726.47735.qmail@web53211.mail.yahoo.com>
On 7/25/06, Otniel Michael <otmic_ie@yahoo.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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To: pgsql-sql@postgresql.org
Cc: postgresql@aranya.com, otmic_ie@yahoo.com
Subject: Re: About Div
In-Reply-To: <bf05e51c0607250800p44e98ce7uea04b19ff0cf8eee@mail.gmail.com>
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