The example would be much clearer as an aggregation query. Roughly: db.demo.aggregate([ { $match: { score: { $gt: 0 }, person:

The example would be much clearer as an aggregation query. Roughly: db.demo.aggregate([ { $match: { score: { $gt: 0 }, person: { $in: ["bob","jake"] }}}, { $group: { _id: "person", sumscore: { $sum: "$score" }, avgscore: { $avg: "$score" }, minscore: { $min: "$score" }, maxscore: { $max: "$score" }, count: { $sum: 1 }}} ]);