Our records show:
{a: 1}
{a: 5}
{a: 3}
Is there a way to aggregate this data and calculate the current sum?
{a: 1, cs: 1}
{a: 5, cs: 6}
{a: 3, cs: 9}
Our records show:
{a: 1}
{a: 5}
{a: 3}
Is there a way to aggregate this data and calculate the current sum?
{a: 1, cs: 1}
{a: 5, cs: 6}
{a: 3, cs: 9}
If you're looking to achieve this specific functionality in MongoDB, your best bet currently is using mapReduce. This method allows for the storage of a "global" variable, crucial for maintaining a "running total" as seen in the example below:
db.collection.mapReduce(
function(){
totals += this.a;
emit(this._id, {"a": this.a, "cs": totals});
},
function() {}, // no reduction needed
{
"out": { "inline": 1 },
"scope": { "totals": 0 }
}
);
While there may not be explicit grouping involved here, it's definitely possible if required. The focus here is on preserving a "running total" for each individual record.
The "mapReduce" command utilizes the "scope" attribute in this case to facilitate the use of a global variable essential for this process.
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