On 01/09/2010 10:29 p, Tompkins Neil wrote:
> Hi,
>
> I'm developing a system whereby a manager gets assigned points based a
> certain number of factors which are saved alongside a football result.
> However, I also want to keep a total for each manager. My question is it
> best to just have a query that uses SUM to total the managers points gained
> for each fixture participated in ? Or should I be looking to have
> a separate field which is the calculated total for each manager ?
>
> Thanks in advance for any advice.
>
> Cheers
> Neil
>
Neil, its generally not a good idea to store totals. I also had that
problem when i thought that as data grows it will slow down the server
to a halt. We have a mobile financial system with a table called trns
that stores all the credits and debits per account. each time a customer
wants his balance we sum up all the debits and credits (debits being
negative) and reply with the answer. We have close to 1 million million
people and each person does around 2 transactions per month, so the trn
table grows 2 million records every month we are in our 3rd month. and
select sum(t_amount) from trn where t_acno = xxxx works like a charm! of
course t_acno is indexed and the server is optimized.
In addition we sum before a debit to see if the balance is suffecient,
before a transfer, blah blah blah ...
So it's all good.
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