如何调整 MongoDB 查询以按降序获取输出

Question

我正在处理转换为 JSON.In 此查询的 OSM 文件，我正在尝试获取 .json file.I 中所有便利设施的计数，需要知道如何使输出反向。

查询:-

db.char.aggregate([{"$match":{"amenity":{"$exists":1}}}, {"$group":{"_id":"$amenity",
"count":{"$sum":1}}}, {"$sort":{"count":1}}, {"$limit":100}])

当前输出：-

{ "_id" : "bar", "count" : 1 }
{ "_id" : "fitness_center", "count" : 1 }
{ "_id" : "fountain", "count" : 1 }
{ "_id" : "studio", "count" : 1 }
{ "_id" : "telephone", "count" : 1 }
{ "_id" : "nightclub", "count" : 1 }
{ "_id" : "shelter", "count" : 1 }
{ "_id" : "courthouse", "count" : 1 }
{ "_id" : "kindergarten", "count" : 1 }
{ "_id" : "doctors", "count" : 1 }
{ "_id" : "laboratory", "count" : 1 }
{ "_id" : "toilets", "count" : 2 }
{ "_id" : "community_centre", "count" : 2 }
{ "_id" : "embassy", "count" : 2 }
{ "_id" : "fire_station", "count" : 2 }
{ "_id" : "townhall", "count" : 2 }
{ "_id" : "prison", "count" : 2 }
{ "_id" : "clinic", "count" : 2 }
{ "_id" : "pub", "count" : 3 }
{ "_id" : "grave_yard", "count" : 3 }

Answer 1

{"$sort":{"count":-1}}

在排序部分应该做你！

如何调整 MongoDB 查询以按降序获取输出

How to tweak the MongoDB query to get the output in descending order

mongodb-query