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From Alexander Shorin <>
Subject Re: Running total?
Date Tue, 31 Jul 2012 06:12:07 GMT

Depends on your data, but just emit transaction id from set as key and
his amount as value with map and _sum these values with reduce
function. If you need totals for all set, then emit [set_id, item_id]
key and group results by specific level.


On Tue, Jul 31, 2012 at 6:38 AM, Samuel Williams
<> wrote:
> Hi,
> Given a set of transactions with each transaction having an integer amount
> or something similar, is it possible to generate a running total for each
> transaction using map-reduce in CouchDB?
> Kind regards,
> Samuel

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