Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"_id":0,"client_id":0,"balance":10,"alias":""},{"_id":1,"client_id":1,"balance":10,"alias":""},]
Query
db.collection.update({"_id":0},{"$set":{"balance":20}})
Result