[{customerName:"Joe",bidValue:178,/** for example in $ - dollars*/tableID:2},{customerName:"Frank",bidValue:212,/** for example in $ - dollars*/tableID:2},{customerName:"Martin",bidValue:123,/** for example in $ - dollars*/tableID:2},{customerName:"John",bidValue:15,/** for example in $ - dollars*/tableID:1},{customerName:"Gino",bidValue:87,/** for example in $ - dollars*/tableID:1},{customerName:"Patrick",bidValue:23,/** for example in $ - dollars*/tableID:3},]

db.collection.aggregate({"$sort":{"bidValue":-1}},{"$group":{"_id":"$tableID","customerName":{"$first":"$customerName"},"bidValue":{"$first":"$bidValue"}}})