Thanks Stifan

can u give some example. i have gone trow that, but i am not getting result 


On Friday, 14 March 2014 17:31:33 UTC+5:30, 黄祥 wrote:
>
> for total number, i think you can achieve it with sum query in dal.
>
> ref :
>
> http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#sum--avg--min--max-and-len
>
> best regards,
> stifan
>

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