Fields to aggregate on, and the names they should be aggregated under.
Sequence of operators specifying aggregate calculation.
Fields to aggregate on, and the names they should be aggregated under.
(groupMulti: StringAdd).self
(groupMulti: StringFormat).self
(groupMulti: ArrowAssoc[GroupMulti]).x
(Since version 2.10.0) Use leftOfArrow
instead
(groupMulti: Ensuring[GroupMulti]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
Groups documents together to calulate aggregates on document collections. This command aggregates on multiple fields, and they must be named. http://docs.mongodb.org/manual/reference/aggregation/group/#_S_group
Fields to aggregate on, and the names they should be aggregated under.
Sequence of operators specifying aggregate calculation.