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?
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.
> 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?
> 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
> <space.ship.travel...@gmail.com> 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?
