【mongo】多個字段進行分組查詢

多個字段進行分組查詢：

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