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Getting MongoDB results from the previous month
At first, get the current month and subtract by 1 to fetch previous month records. Let us first create a collection with documents −
> db.findOneMonthAgoData.insertOne({"CustomerName":"Chris","PurchaseDate":new ISODate("2019-12-26")}); { "acknowledged" : true, "insertedId" : ObjectId("5e04e16c150ee0e76c06a04f") } > db.findOneMonthAgoData.insertOne({"CustomerName":"David","PurchaseDate":new ISODate("2019-11-26")}); { "acknowledged" : true, "insertedId" : ObjectId("5e04e178150ee0e76c06a050") } > db.findOneMonthAgoData.insertOne({"CustomerName":"Bob","PurchaseDate":new ISODate("2020-11-26")}); { "acknowledged" : true, "insertedId" : ObjectId("5e04e186150ee0e76c06a051") }
Following is the query to display all documents from a collection with the help of find() method −
> db.findOneMonthAgoData.find();
This will produce the following output −
{ "_id" : ObjectId("5e04e16c150ee0e76c06a04f"), "CustomerName" : "Chris", "PurchaseDate" : ISODate("2019-12-26T00:00:00Z") } { "_id" : ObjectId("5e04e178150ee0e76c06a050"), "CustomerName" : "David", "PurchaseDate" : ISODate("2019-11-26T00:00:00Z") } { "_id" : ObjectId("5e04e186150ee0e76c06a051"), "CustomerName" : "Bob", "PurchaseDate" : ISODate("2020-11-26T00:00:00Z") }
Here is the query to get result from previous month −
> monthData=new Date(); ISODate("2019-12-26T16:43:04.283Z") > monthData.setMonth(monthData.getMonth() - 1); 1574786584283 > db.findOneMonthAgoData.find({PurchaseDate:{$gte:monthData}});
This will produce the following output −
{ "_id" : ObjectId("5e04e16c150ee0e76c06a04f"), "CustomerName" : "Chris", "PurchaseDate" : ISODate("2019-12-26T00:00:00Z") } { "_id" : ObjectId("5e04e186150ee0e76c06a051"), "CustomerName" : "Bob", "PurchaseDate" : ISODate("2020-11-26T00:00:00Z") }
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