我想从MongoDB聚合中的组管道中获取百分比。我的数据:{_id:1,name:'hello',type:'big'},{_id:2,name:'bonjour',type:'big'},{_id:3,name:'hi',type:'short'},{_id:4,name:'salut',type:'short'},{_id:5,name:'ola',type:'short'}我的请求按类型和计数分组:[{$group:{_id:{type:'$type'},"count":{"$sum":1}}}]结果:[{_id{type:'big',},count:2},{_id{type:'
我想从MongoDB聚合中的组管道中获取百分比。我的数据:{_id:1,name:'hello',type:'big'},{_id:2,name:'bonjour',type:'big'},{_id:3,name:'hi',type:'short'},{_id:4,name:'salut',type:'short'},{_id:5,name:'ola',type:'short'}我的请求按类型和计数分组:[{$group:{_id:{type:'$type'},"count":{"$sum":1}}}]结果:[{_id{type:'big',},count:2},{_id{type:'
假设我有以下类的对象列表。classContact(valname:String//...)我想检索Map它将名称映射到其出现次数。在基于SQL的数据库上我会查询:SELECTname,count(*)FROMContactGROUPBYname;在Kotlin中使用高阶函数执行此操作的最佳方法是什么？ 最佳答案 如果联系人的类型为List您可以执行以下操作:valnumOccurencesMap=contacts.groupingBy{it.name}.eachCount()numOccurencesMap将是Map类型.
基本上我想将单个OnClickListener附加到ConstraintLayout内的多个View。在迁移到ConstraintLayout之前，我可以在一个布局中添加一个监听器的View。现在它们与ConstraintLayout下的其他View位于同一层。我尝试将View添加到android.support.constraint.Group并以编程方式向其中添加OnClickListener。group.setOnClickListener{Log.d("OnClick","groupClickListenertriggered")}但是，这似乎不适用于ConstraintLay
我想使用RecyclerViewLib在我的项目中，为此我下载了它并将其作为模块导入到我空的“helloworld”Android项目中。我正在使用androidstudiov1.0.1使用sdkmanagerv24，这是我的app/build.gradleapplyplugin:'com.android.application'android{compileSdkVersion17buildToolsVersion"19.1.0"defaultConfig{applicationId"com.example.mk.dragdrop4"minSdkVersion14targetSdkV
dockerrun参数有什么区别:-u,--user=""SetstheusernameorUIDusedandoptionallythegroupnameorGIDforthespecifiedcommand.Thefollowingsexamplesareallvalid:--user[user|user:group|uid|uid:gid|user:gid|uid:group]Withoutthisargumentthecommandwillberunasrootinthecontainer.和--group-add=[]Addadditionalgroupstorunas?
我想为我在Mongoid中的分组提供一个条件，但是如何为条件哈希中的一个属性发送多个值？这就是我想做的:PageViews.collection.group(cond:{page_id:['4e6912618083ab383e000010','4e6912618083ab383e000009']},key:'timestamp',initial:{count:0},reduce:"function(x,y){y.count+=x.count;}")因此，任何带有page_id的PageView都将是查询的一部分，但我似乎无法获得条件哈希(cond)工作!我在这里做错了什么，我真的很困惑
这是我的文档架构:{"_id":ObjectId("5203c8b91afdd7160c6ecfd3"),"answer_calls":"","start":"10:00","end":"10:30","VDN_name":"SP_SYNDICATED_7","total_calls":"1","date":"01/07/2013","abandoned_calls":"","voicemail_calls":""}我尝试通过聚合框架:>dir.aggregate([{$group:{_id:{fecha:"$date",hora:"$start"},llamadas:{$sum:"$
在下面的查询中{$group:{_id:{success:'$success',responseCode:'$responseCode',label:'$label'},max_timeStamp:{$timeStamp:1},count_responseCode:{$sum:1},avg_value:{$sum:"$value"},count_success:{$sum:1}}}_id:{success:'$success',responseCode:'$responseCode',label:'$label'},如何翻译成在javamongodb驱动中使用。我试过了BasicDBL
我有以下文档结构{"app_id":"DHJFK67JDSJjdasj909","date":ISODate("2014-08-07T00:00:00.000Z"),"event_count":100,"events":[{"type":0,"value":12},{"type":10,"value":24},{"type":20,"value":36},{"type":30,"value":43}],"unique_events":[{"type":0,"value":5},{"type":10,"value":8},{"type":20,"value":12},{"type":30
