quosdolorem
Version:
The MongoDB Shell
17 lines (16 loc) • 586 B
JavaScript
// before
db.coll.deleteMany({});
db.coll.insertOne({status: "A", amount: 1, group: "G1"});
db.coll.insertOne({status: "A", amount: 2, group: "G1"});
db.coll.insertOne({status: "A", amount: 3, group: "G1"});
db.coll.insertOne({status: "A", amount: 1, group: "G2"});
db.coll.insertOne({status: "A", amount: 1, group: "G2"});
db.coll.insertOne({status: "B", amount: 1, group: "G2"});
// command
db.coll.aggregate([
{$match: {status: "A"}},
{$group: {_id: "$group", total: {$sum: "$amount"}}},
{$sort: {total: -1}}
], {readConcern: {level: "local"}});
// clear
db.coll.drop();