【mongo】多个字段进行分组查询

多个字段进行分组查询：

db.biao.aggregate([{ "$match":{"create_time": { $gte:1547049600000, $lte:1547135999000} }},{"$group":{"_id":{"clue_param_vals":"$clue_param_vals.来源","create_person_id":"$create_person_id","campus_id": "$campus_id"},"学员数":{$sum:1}}}]);