You can use $in operator to find with multiple array items. To understand the concept, let us create a collection with the document.
The query to create a collection with a document is as follows −
>db.findByMultipleArrayDemo.insertOne({"StudentFirstName":"John","StudentLastName":"Smith", "StudentCoreSubject":["Compiler","Operating System","Computer Networks"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c7ef07b559dd2396bcfbfc4") } >db.findByMultipleArrayDemo.insertOne({"StudentFirstName":"Carol","StudentLastName":"Taylor", "StudentCoreSubject":["MongoDB","MySQL","SQL Server"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c7ef09d559dd2396bcfbfc5") } >db.findByMultipleArrayDemo.insertOne({"StudentFirstName":"Bob","StudentLastName":"Taylor", "StudentCoreSubject":["MongoDB","MySQL","SQL Server"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c7ef0c7559dd2396bcfbfc6") } >db.findByMultipleArrayDemo.insertOne({"StudentFirstName":"David","StudentLastName":"Johnson", "StudentCoreSubject":["Compiler","Operating System","Computer Networks"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c7ef0f2559dd2396bcfbfc7") }
Display all documents from a collection with the help of find() method. The query is as follows −
> db.findByMultipleArrayDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c7ef07b559dd2396bcfbfc4"), "StudentFirstName" : "John", "StudentLastName" : "Smith", "StudentCoreSubject" : [ "Compiler", "Operating System", "Computer Networks" ] } { "_id" : ObjectId("5c7ef09d559dd2396bcfbfc5"), "StudentFirstName" : "Carol", "StudentLastName" : "Taylor", "StudentCoreSubject" : [ "MongoDB", "MySQL", "SQL Server" ] } { "_id" : ObjectId("5c7ef0c7559dd2396bcfbfc6"), "StudentFirstName" : "Bob", "StudentLastName" : "Taylor", "StudentCoreSubject" : [ "MongoDB", "MySQL", "SQL Server" ] } { "_id" : ObjectId("5c7ef0f2559dd2396bcfbfc7"), "StudentFirstName" : "David", "StudentLastName" : "Johnson", "StudentCoreSubject" : [ "Compiler", "Operating System", "Computer Networks" ] }
Use $in operator to find by multiple array items −
> db.findByMultipleArrayDemo.find({ StudentCoreSubject: { $in: ["Compiler", "Computer Networks"] }}).pretty();
The following is the output −
{ "_id" : ObjectId("5c7ef07b559dd2396bcfbfc4"), "StudentFirstName" : "John", "StudentLastName" : "Smith", "StudentCoreSubject" : [ "Compiler", "Operating System", "Computer Networks" ] } { "_id" : ObjectId("5c7ef0f2559dd2396bcfbfc7"), "StudentFirstName" : "David", "StudentLastName" : "Johnson", "StudentCoreSubject" : [ "Compiler", "Operating System", "Computer Networks" ] }