如何在mongodb中找到两个日期之间的小时差 [英] How to find the hours difference between two dates in mongodb

问题描述

我的 mongodb 中保存了以下结构的文档.

I have the documents in following structure saved in my mongodb.

用户日志

{
"_id":"111",
"studentID" : "1",
"loginTime" : "2019-05-01 09:40:00",
"logoutTime" : "2019-05-01 19:40:00"
},
{
"_id":"222",
"studentID" : "1",
"loginTime" : "2019-05-02 09:40:00",
"logoutTime" : "2019-05-02 20:40:00"
},
{
"_id":"333",
"studentID" : "2",
"loginTime" : "2019-05-02 09:40:00",
"logoutTime" : "2019-05-02 20:40:00"
}

是否可以查询 loginTime 和 logoutTime 之间的时间段的文档.eg: grater than 20 hrs

is it possible to query for documents where the period of time between loginTime and logoutTime.eg: grater than 20 hrs

mongodb 版本 = 3.4

推荐答案

你可以使用下面的聚合

db.collection.aggregate([
  { "$project": {
    "difference": {
      "$divide": [
        { "$subtract": ["$logoutTime", "$loginTime"] },
        60 * 1000 * 60
      ]
    }
  }},
  { "$group": {
    "_id": "$studentID",
    "totalDifference": { "$sum": "$difference" }
  }},
  { "$match": { "totalDifference": { "$gte": 20 }}}
])

您只需 $subtract loginTime from logoutTime 它会给你减去的时间戳，然后只是 $divide 它与 3600000 到以小时为单位获取时间.

You have to just $subtract loginTime from logoutTime and it will give you the subtracted timestamp and then just $divide it with 3600000 to get the time in hours.

MongoPlayground

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