mongodb数据分组按字符串split
2018-12-25 17:15 slmk 阅读(2689) 评论(0) 编辑 收藏 举报db.getCollection('users').aggregate([ {$match:{ZWBH:11}}, {$unwind:'$UUID'}, {$project : { PM : { $split: ["$UUID.name", " "] } } }, {$project: {PM:{ $arrayElemAt: [ "$PM", 0 ]}}}, {$project: {PM:{ $toLower: "$PM"}}}, {$group:{_id:'$PM',sum:{$sum:1}}}, {$sort:{sum:-1}} ])
分组用户所用的手机品牌数量,其中UUID的格式是:
"UUID" : [ { "id" : "xxxxxx", "name" : "HUAWEI DUK-AL20" } ],