mongodb 分组统计: 按deviceId、tenant分组，统计总记录条数、求和workload

mongodb 分组统计: 按deviceId、tenant分组，统计总记录条数、求和workload

db.RollerWorkingPeriod.aggregate( {
        $match:{tenant:"A01"}},
        {$group:{ _id: {deviceId:"$deviceId",tenant:"$tenant"},
                       count:{$sum:1},
                       seconds:{$sum: "$seconds"}}
     } )

删除senconds列

  db.RollerWorkingPeriod.update(
        {}, 
        { $unset: { seconds: 1} }, 
        false, 
        true
    )

添加senconds列

   db.RollerWorkingPeriod.update(
        {}, 
        { $set: { seconds: 2} }, 
        false, 
        true
    )