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Map Reduce Example
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| use tutorial | |
| db.orders.insert({ cust_id: "A123", amount: 500, status: "A" }) | |
| db.orders.insert({ cust_id: "A123", amount: 250, status: "A" }) | |
| db.orders.insert({ cust_id: "B212", amount: 200, status: "A" }) | |
| db.orders.insert({ cust_id: "A123", amount: 300, status: "D" }) | |
| // Calculate the sum of all “amount”s for a unique “cust_id” | |
| var map = function() { | |
| emit(this.cust_id, this.amount); | |
| } | |
| var reduce = function(keyCustId, values) { | |
| return Array.sum(values); | |
| } | |
| var options = { | |
| query: { status: "A" }, | |
| out: "order_totals" | |
| } | |
| db.orders.mapReduce(map, reduce, options) |
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