Database

[{"_id":{"$oid":"5f88525a475fc997297fb93f"},"Date":{"$date":"2018-01-01T00:01:00.000Z"},"Code":"54","Category":"ART._HYGIENIC","Name":"BELLA PODPASKI NOVA MAXI 10","Quantity":{"$numberDecimal":"1"},"Unit Net Cost":{"$numberDecimal":"2.66"},"Sale Net Cost":{"$numberDecimal":"2.66"},"Unit Net Price":{"$numberDecimal":"1.85"},"Sale Net Price":{"$numberDecimal":"1.85"},"Unit Gross Value":{"$numberDecimal":"2"},"Sale Gross Value":{"$numberDecimal":"2"},"Share in Sales %":{"$numberDecimal":"0"},"Margin %":{"$numberDecimal":"-43.78"},"Unit Margin %":{"$numberDecimal":"-0.81"},"Sell Margin %":{"$numberDecimal":"-0.81"},"Share in Margin %":{"$numberDecimal":"-0.01"}},{"_id":{"$oid":"5f88525a475fc997297fb92f"},"Date":{"$date":"2018-01-01T00:01:00.000Z"},"Code":"54","Category":"ART._HYGIENIC","Name":"BELLA PODPASKI NOVA MAXI 10","Quantity":{"$numberDecimal":"1"},"Unit Net Cost":{"$numberDecimal":"2.66"},"Sale Net Cost":{"$numberDecimal":"2.66"},"Unit Net Price":{"$numberDecimal":"1.85"},"Sale Net Price":{"$numberDecimal":"1.85"},"Unit Gross Value":{"$numberDecimal":"2"},"Sale Gross Value":{"$numberDecimal":"100"},"Share in Sales %":{"$numberDecimal":"0"},"Margin %":{"$numberDecimal":"-43.78"},"Unit Margin %":{"$numberDecimal":"-0.81"},"Sell Margin %":{"$numberDecimal":"-0.81"},"Share in Margin %":{"$numberDecimal":"-0.01"}}]

Query

db.collection.aggregate([{"$group":{"_id":null,"total":{"$sum":"$Sale Gross Value"}}}])

Result