To upsert many documents, use UPSERT() with UPDATE(). Let us create a collection with documents −> db.demo425.insertOne({"Name":"Chris", "Age":21}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e74ee4fbbc41e36cc3cae6c") } > db.demo425.insertOne({"Name":"David", "Age":23}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e74ee56bbc41e36cc3cae6d") } > db.demo425.insertOne({"Name":"Chris", "Age":21}); {    "acknowledged" : true,   ... Read More

To extract a MongoDB document with a specific string, use $match in MongoDB. Let us create a collection with documents −> db.demo424.insert( ...    { ... ...       "Information" : [ ...          { ...             id:10, ...     ... Read More

To speed up the $group phase, use $group along with aggregation. Let us see an example and create a collection with documents −> db.demo423.insertOne({"Information":[101, 110, 87, 110, 98, 115, 101, 115, 89, 115]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e73a60e9822da45b30346e6") }Display all documents from a collection with the ... Read More

For exact match, set the values to be matched inside MongoDB $in(). Let us first create a collection with documents −> db.demo422.insertOne({"Name":"Chris", "Marks":34}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e73a4059822da45b30346e1") } > db.demo422.insertOne({"Name":"Chris", "Marks":56}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e73a40a9822da45b30346e2") } > db.demo422.insertOne({"Name":"David", "Marks":78}); { ... Read More

To insert date in MongoDB, use Date(). Let us create a collection with documents −> db.demo421.insert({"DueDate":new Date(Date.now())}); WriteResult({ "nInserted" : 1 }) > db.demo421.insert({"DueDate":new Date("2020-01-15")}); WriteResult({ "nInserted" : 1 }) > db.demo421.insert({"DueDate":new Date("2018-12-31")}); WriteResult({ "nInserted" : 1 })Display all documents from a collection with the help of find() method −> ... Read More

To combine unique items from array, use aggregate() in MongoDB. Let us create a collection with documents −> db.demo420.insert( ...    { ... ...       "details" : [ ...          { ...             "Value1":10, ...           ... Read More

Let us first create a collection with documents −>db.demo419.insertOne({"ProductInformation":[{"ProductName":"Product-1", "ProductPrice":500}, {"ProductName":"Product-2", "ProductPrice":600}]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e724762b912067e57771ae8") }Display all documents from a collection with the help of find() method −> db.demo419.find();This will produce the following output −{ "_id" : ObjectId("5e724762b912067e57771ae8"), "ProductInformation" : [ { "ProductName" : ... Read More

For this, use aggregate(). Let us first create a collection with documents −> db.demo418.insertOne( ...    { ...       "details":[ ...          { ...             "CountryName":"US", ...             "Marks":45 ...          }, ... Read More

Let us first create a collection with documents −> db.demo417.insertOne({"EmployeeName":"Chris", "EmployeeSalary":500}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e723ebbb912067e57771ae4") } > db.demo417.insertOne({"EmployeeName":"Mike", "EmployeeSalary":1000}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e723ed7b912067e57771ae5") }Display all documents from a collection with the help of find() method −> db.demo417.find();This will produce the ... Read More

To convert collection to capped, use runCommand(). It provides a helper to run specified database commands. Let us first create a collection with documents −> db.demo416.insertOne({"StudentName":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e723a7bb912067e57771adf") } > db.demo416.insertOne({"StudentName":"Mike"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e723a81b912067e57771ae0") } > db.demo416.insertOne({"StudentName":"Sam"}); ... Read More