Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"_id":"A","requi":null},{"_id":"D","requi":["A","B"]},{"_id":"E","requi":["B"]},{"_id":"B","requi":null},{"_id":"C","requi":["A"]}]
Query
db.collection.find({requi:{$eq:["A"]}})
Result