To fetch all the ids, simply use find() in MongoDB. Let us create a collection with documents −> db.demo169.insertOne({"StudentName":"Chris"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e36975e9e4f06af551997d7") } > db.demo169.insertOne({"StudentName":"Bob"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3697629e4f06af551997d8") } > db.demo169.insertOne({"StudentName":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3697679e4f06af551997d9") }Display all documents from a collection with the help of find() method −> db.demo169.find();This will produce the following output −{ "_id" : ObjectId("5e36975e9e4f06af551997d7"), "StudentName" : "Chris" } { "_id" : ObjectId("5e3697629e4f06af551997d8"), "StudentName" : "Bob" } { "_id" : ObjectId("5e3697679e4f06af551997d9"), "StudentName" : "David" }Following is the query to get ... Read More

To increment a date, use setDate, getDate() and perform increment operation. Let us first create a collection with documents −> db.demo168.insertOne({"DueDate":null}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3695ae9e4f06af551997d6") }Display all documents from a collection with the help of find() method −> db.demo168.find();This will produce the following output −{ "_id" : ObjectId("5e3695ae9e4f06af551997d6"), "DueDate" : null }Following is the query to increment a date in JavaScript, in order to update MongoDB −> var t = new Date(); > t.setDate(t.getDate()+1); 1580722089017 > > var dat = new Date(); > dat .setDate(dat .getDate()+2); 1580808489085 > > db.demo168.update( ...    { "_id": ObjectId("5e3695ae9e4f06af551997d6") ... Read More

For this, use aggregate() and $group. To get minimum and maximum value, use $min and $max.Let us create a collection with documents −> db.demo167.insertOne({"Score":60}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3693a79e4f06af551997d1") } > db.demo167.insertOne({"Score":80}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3693ab9e4f06af551997d2") } > db.demo167.insertOne({"Score":60}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3693ad9e4f06af551997d3") } > db.demo167.insertOne({"Score":90}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3693b09e4f06af551997d4") } > db.demo167.insertOne({"Score":89}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3693b69e4f06af551997d5") }Display all documents from a collection with the help of find() method −> db.demo167.find();This will produce the following output ... Read More

Let us create a collection with documents −> db.demo166.insertOne({"details" : { "UserName" : "Chris", "UserAge":29, "PhoneDetails" : { "PhoneNumber" : "98646463533" } } }); {    "acknowledged" : true,    "insertedId" : ObjectId("5e368b159e4f06af551997cf") } > db.demo166.insertOne({"details" : { "UserName" : "David", "UserAge":21, "PhoneDetails" : { "PhoneNumber" : "87664534654" } } }); {    "acknowledged" : true,    "insertedId" : ObjectId("5e368b159e4f06af551997d0") }Display all documents from a collection with the help of find() method −> db.demo166.find();This will produce the following output −{ "_id" : ObjectId("5e368b159e4f06af551997cf"), "details" : { "UserName" : "Chris", "UserAge" : 29, "PhoneDetails" : { "PhoneNumber" : "98646463533" } } ... Read More

To remove only a single document in MongoDB, use remove(). Let us create a collection with documents −> db.demo165.insertOne({"ClientId":101, "ClientName":"Chris", "ClientAge":34}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e36895c9e4f06af551997cc") } > db.demo165.insertOne({"ClientId":102, "ClientName":"Bob", "ClientAge":32}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3689659e4f06af551997cd") } > db.demo165.insertOne({"ClientId":103, "ClientName":"David", "ClientAge":35}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e36896d9e4f06af551997ce") }Display all documents from a collection with the help of find() method −> db.demo165.find();This will produce the following output −{ "_id" : ObjectId("5e36895c9e4f06af551997cc"), "ClientId" : 101, "ClientName" : "Chris", "ClientAge" : 34 } { "_id" : ObjectId("5e3689659e4f06af551997cd"), "ClientId" : 102, "ClientName" : ... Read More

Use aggregate() and within that to sort, use $sort in MongoDB. Let us create a collection with documents −> db.demo164.insertOne({"StudentAge":24}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e36883d9e4f06af551997c8") } > db.demo164.insertOne({"StudentAge":25}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3688409e4f06af551997c9") } > db.demo164.insertOne({"StudentAge":22}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3688429e4f06af551997ca") } > db.demo164.insertOne({"StudentAge":21}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3688439e4f06af551997cb") }Display all documents from a collection with the help of find() method −> db.demo164.find();This will produce the following output −{ "_id" : ObjectId("5e36883d9e4f06af551997c8"), "StudentAge" : 24 } { "_id" : ObjectId("5e3688409e4f06af551997c9"), "StudentAge" : 25 } ... Read More

In MongoDB, $all is used to select the documents where the value of a field is an array that contains all the specified elementsLet us create a collection with documents −> db.demo163.insertOne( ...    { ...       "ClientDetails": [{ ...          "ClientName": "Chris" ... ...       }, { ...          "ClientName": "David" ... ...       } ...    ] ... ... } ... ); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3686d49e4f06af551997c5") } > db.demo163.insertOne( ...    { ...       "ClientDetails": [{ ...     ... Read More

This can be easily achieved using MongoDB update(). Let us create a collection with documents −> db.demo162.insertOne({"StudentName":"Chris"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3684359e4f06af551997c2") } > db.demo162.insertOne({"StudentName":"Bob"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3684389e4f06af551997c3") } > db.demo162.insertOne({"StudentName":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e36843c9e4f06af551997c4") }Display all documents from a collection with the help of find() method −> db.demo162.find();This will produce the following output −{ "_id" : ObjectId("5e3684359e4f06af551997c2"), "StudentName" : "Chris", "StudentAge" : 23 } { "_id" : ObjectId("5e3684389e4f06af551997c3"), "StudentName" : "Bob" } { "_id" : ObjectId("5e36843c9e4f06af551997c4"), "StudentName" : "David" }Here is the query to ... Read More

To search for multiple documents in MongoDB, use $in. Let us create a collection with documents −> db.demo161.insertOne({"ClientId":101, "ClientName":"Chris"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3577cafdf09dd6d0853a09") } > db.demo161.insertOne({"ClientId":102, "ClientName":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3577d0fdf09dd6d0853a0a") } > db.demo161.insertOne({"ClientId":103, "ClientName":"David", "ClientAge":35}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3577dffdf09dd6d0853a0b") } > db.demo161.insertOne({"ClientId":104, "ClientName":"Carol", "ClientAge":31}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3577eefdf09dd6d0853a0c") }Display all documents from a collection with the help of find() method −> db.demo161.find();This will produce the following output −{ "_id" : ObjectId("5e3577cafdf09dd6d0853a09"), "ClientId" : 101, "ClientName" : "Chris" } { ... Read More

To count duplicate date records in MongoDB, use aggregate() and $group. Let us create a collection with documents −> db.demo160.insertOne({"DueDate":new ISODate()}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e357525fdf09dd6d0853a04") } > db.demo160.insertOne({"DueDate":new ISODate("2019-01-11")}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e357532fdf09dd6d0853a05") } > db.demo160.insertOne({"DueDate":new ISODate()}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e357534fdf09dd6d0853a06") } > db.demo160.insertOne({"DueDate":new ISODate("2019-01-11")}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e357538fdf09dd6d0853a07") } > db.demo160.insertOne({"DueDate":new ISODate("2020-04-10")}); {    "acknowledged" : true,    "insertedId" : ObjectId("5e357542fdf09dd6d0853a08") }Display all documents from a collection with the help of find() method −> db.demo160.find();This will produce the following ... Read More