Let’s say we need to find a document with a value greater than specific value. For this, use dot notation in nested document and set the condition with $gt.Let us see an example and create a collection with documents −> db.demo688.insert( ... { ... information:{id:1, details:[ ...    {otherDetails:{ ...       values:75 ...       } ...    } ... ] ... } ... } ... ) WriteResult({ "nInserted" : 1 }) > db.demo688.insert({ ... information: ... { ... id:2, ... details: ... [ ...    {otherDetails:{ ...       values:78 ...    } ... } ... Read More

To access inner element of JSON array in MongoDB, use dot notation. Let us create a collection with documents −> db.demo687.insert({CountryName:'US', ... info: ... { ... id:101, ... details: ... [ ... { ...    Name:'Chris', ...    SubjectName:'MongoDB', ...    otherDetails:{ ...       "Marks":58, ...       Age:23 ...    } ... } ... ] ... } ... } ... ) WriteResult({ "nInserted" : 1 }) > db.demo687.insert({CountryName:'UK', ... info: ... { ... id:102, ... details: ... [ ... { ...    Name:'David', ...    SubjectName:'MySQL', ...    otherDetails:{ ...       "Marks":78, ...   ... Read More

To implement similar to “like”, use find() along with // in MongoDB. Let us create a collection with documents −> db.demo686.insertOne({"FirstName":"Robert"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea55182a7e81adc6a0b395c") } > db.demo686.insertOne({"FirstName":"John"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea55186a7e81adc6a0b395d") } > db.demo686.insertOne({"FirstName":"ROBERT"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea5518fa7e81adc6a0b395e") } > db.demo686.insertOne({"FirstName":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea55195a7e81adc6a0b395f") } > db.demo686.insertOne({"FirstName":"robert"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea5519ba7e81adc6a0b3960") }Display all documents from a collection with the help of find() method −> db.demo686.find();This will produce the following output −{ "_id" : ... Read More

For this, use aggregate(). Let’s say we have to fetch documents with a field “Age” with value “21”.Let us now create a collection with documents −> db.demo685.insertOne( ...    { ...       "details": ...       [ ...          { ...             Name:"Chris", ...             Age:21 ...          }, ...          { ...             Name:"David", ...             Age:23 ...          }, ...       ... Read More

Use $natural to sort natural in MongoDB. Let us create a collection with documents −> db.demo684.insertOne({Value:10}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea530cea7e81adc6a0b3957") } > db.demo684.insertOne({Value:50}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea530d1a7e81adc6a0b3958") } > db.demo684.insertOne({Value:60}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea530d4a7e81adc6a0b3959") } > db.demo684.insertOne({Value:40}); {    "acknowledged" : true,    "insertedId" : ObjectId("5ea530d8a7e81adc6a0b395a") }Display all documents from a collection with the help of find() method −> db.demo684.find();This will produce the following output −{ "_id" : ObjectId("5ea530cea7e81adc6a0b3957"), "Value" : 10 } { "_id" : ObjectId("5ea530d1a7e81adc6a0b3958"), "Value" : 50 } { "_id" : ObjectId("5ea530d4a7e81adc6a0b3959"), ... Read More

If you try to add a number to undefined value then you will get a NaN. The NaN defines Not a Number. Following is an example −Case 1var anyVar=10+undefined; print(anyVar) //Result will be NaNCase 2var anyVar1=10; var anyVar2; var anyVar=yourVar1+yourVar2; print(anyVar) //Result will be NaNCase 1Let us implement the above cases. The query is as follows −> var result=10+undefined; > print(result);This will produce the following output −NaNCase 2Let us implement the above case −> var value; > var value1=10; > var result=value1+value > resultThis will produce the following output −NaN

To count the documents, use $count. For values beginning with 13, use $regex. You can use $regex. Let us create a collection with documents −> db.demo570.insertOne({Information:{Value:"13675"}});{    "acknowledged" : true, "insertedId" : ObjectId("5e90959b39cfeaaf0b97b583") } > db.demo570.insertOne({Information:{Value:"14135"}});{    "acknowledged" : true, "insertedId" : ObjectId("5e9095a739cfeaaf0b97b584") } > db.demo570.insertOne({Information:{Value:"15113"}});{    "acknowledged" : true, "insertedId" : ObjectId("5e9095b639cfeaaf0b97b585") } > db.demo570.insertOne({Information:{Value:"13141"}});{    "acknowledged" : true, "insertedId" : ObjectId("5e9095c139cfeaaf0b97b586") }Display all documents from a collection with the help of find() method −> db.demo570.find();This will produce the following output −{ "_id" : ObjectId("5e90959b39cfeaaf0b97b583"), "Information" : { "Value" : "13675" } } { "_id" : ObjectId("5e9095a739cfeaaf0b97b584"), "Information" : ... Read More

Let us create a collection with documents −> db.demo568.insertOne({ _id: 101, details: [ {id : 101 }, { id:103 } ] }); { "acknowledged" : true, "insertedId" : 101 }Display all documents from a collection with the help of find() method −> db.demo568.find();This will produce the following output −{ "_id" : 101, "details" : [ { "id" : 101 }, { "id" : 103 } ] } Following is the query to create second collection: > db.demo569.insertOne({ _id: 101, details: "John" }) { "acknowledged" : true, "insertedId" : 101 } > db.demo569.insertOne({ _id: 102, details: "Chris" }) { "acknowledged" : ... Read More

Set the fields you don’t want to include as 0 as in the below syntax. Here, we have set fields “yourFieldName1” and “yourFieldName2” as 0 −db.yourCollectionName.find(yourQuery, {yourFieldName1:0, yourFieldName2:0});To understand the above syntax, let us create a collection with documents −> db.demo567.insertOne({"Name":"Chris", Age:21});{    "acknowledged" : true, "insertedId" : ObjectId("5e908fa139cfeaaf0b97b57b") } > db.demo567.insertOne({"Name":"David", Age:23});{    "acknowledged" : true, "insertedId" : ObjectId("5e908fa939cfeaaf0b97b57c") } > db.demo567.insertOne({"Name":"Bob", Age:22});{    "acknowledged" : true, "insertedId" : ObjectId("5e908faf39cfeaaf0b97b57d") } > db.demo567.insertOne({"Name":"Carol", Age:20});{    "acknowledged" : true, "insertedId" : ObjectId("5e908fb539cfeaaf0b97b57e") }Display all documents from a collection with the help of find() method −> db.demo567.find();This will produce the following ... Read More

To group the array items, use $group along with $sort. Let us create a collection with documents −> db.demo566.insertOne( ... { ... ...    "ProductInformation" : [ ...       { ...          "ProductName" : "Product-1", ...          "ProductPrice" :100 ...       }, ...       { ...          "ProductName" : "Product-2", ...          "ProductPrice" :1100 ...       }, ...       { ...          "ProductName" : "Product-3", ...          "ProductPrice" :100 ...     ... Read More