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I've added the "key value pairs" but I don't seem to be able to get anything from the data.

> db.testmyCrypto.mapReduce(function() { emit( this.slug, this.symbol, this.name, this.date, this.ranknow, this.open, this.high, this.low, this.close, this.volume, this.market, this.close_ratio, this.spread ); }, function(key, values) { return Array.sum( values ) }, { query: { slug:"bitcoin" }, out: "Date 04-28" } )

{ "result" : "Date 04-28", "timeMillis" : 816,

"counts" : {
    "input" : 0,
    "emit" : 0,
    "reduce" : 0,
    "output" : 0
},
"ok" : 1 }

I've scraped the above and now im doing the following from the link to the map-reduce. Is this the correct output, someone ?

> db.testmyCrypto.mapReduce(function() { emit( this.slug, this.symbol ); }, function(key, values) { return Array.sum( values ) },
... {
... query: { date:"2013-04-28" },
... out: "Date 04-28"
... }
... )
{
    "result" : "Date 04-28",
    "timeMillis" : 837,
    "counts" : {
        "input" : 0,
        "emit" : 0,
        "reduce" : 0,
        "output" : 0
    },
    "ok" : 1
}

I'm new to programming and mongoDB and learning as I go, I'm attempting a mapreduce on a dataset using mongoDB. So far I've converted the csv to json and imported it into a mongoDB using compass.

I'm new to programming and mongoDB and learning as I go, I'm attempting a mapreduce on a dataset using mongoDB. So far I've converted the csv to json and imported it into a mongoDB using compass.