On 18 Jul 2011 at 23:00, Martín Marqués <martin.marq...@gmail.com> wrote: 

> I'm building a table (which is a report that has to be printed) with a
> bunch of items (up to 300 in some cases) that have unitary price
> (stored in a numeric(9,2) field), how many there are, and the total
> price for each item. At the end of the table there is a total of all
> the items.
> The app is running on PHP and PostgreSQL is the backend.
> The question is, how do I get the total of everything?
> Running it on PHP gives one value, doing a sum() on the backend gives
> another, and I'm starting to notice that even using python as a
> calculator gives me errors (big ones). Right now I'm doing the maths
> by hand to find out who has the biggest error, or if any is 100%
> accurate.

Much safer to price everything internally in pence or cents or whatever, and 
convert to £xxx.xx for external display. Then just use integer arithmetic for 
the calculations.

Cheers  --  Tim

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