am Wed, dem 12.12.2007, um 10:34:35 +0900 mailte Paul Lambert folgendes:
> I have a table of account balances as at the end of a working day and
> want to from that, calculate daily total figures.
>
> Eg, let's say I have a table structure of:
> year_id integer
> month_id integer
> working_day integer
Why this broken data types? We have date and timestamp[tz].
> I suspect the second option would be more efficient than the first, and
> probably easier to implement since it would be easier to handle
> cross-month boundaries, i.e. day 1's daily total will be the amount on
> that day minus the amount of the final day in the previous month - but
> does anyone have any alternate suggestions that would be better still?
Yes, i would also write a similar function. And if you have proper
datatypes it would be simpler to calculate the previous date and you can
use a proper index on the date column.
Andreas
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Andreas Kretschmer
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