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MongoDB equivalent of WHERE IN(1,2,…)?
The MongoDB equivalent of WHERE IN(1,2,....) is $in operator. The syntax is as follows
db.yourCollectionName.find({yourFieldName:{$in:[yourValue1,yourValue2,....N]}}).pretty();
Let us first create a collection with documents
> db.whereInDemo.insertOne({"StudentName":"John","StudentMathScore":57}); { "acknowledged" : true, "insertedId" : ObjectId("5ca281ec6304881c5ce84ba5") } > db.whereInDemo.insertOne({"StudentName":"Larry","StudentMathScore":89}); { "acknowledged" : true, "insertedId" : ObjectId("5ca281f56304881c5ce84ba6") } > db.whereInDemo.insertOne({"StudentName":"Chris","StudentMathScore":98}); { "acknowledged" : true, "insertedId" : ObjectId("5ca281fd6304881c5ce84ba7") } > db.whereInDemo.insertOne({"StudentName":"Robert","StudentMathScore":99}); { "acknowledged" : true, "insertedId" : ObjectId("5ca2820a6304881c5ce84ba8") } > db.whereInDemo.insertOne({"StudentName":"Bob","StudentMathScore":97}); { "acknowledged" : true, "insertedId" : ObjectId("5ca282206304881c5ce84ba9") }
Following is the query to display all documents from a collection with the help of find() method
> db.whereInDemo.find().pretty();
This will produce the following output
{ "_id" : ObjectId("5ca281ec6304881c5ce84ba5"), "StudentName" : "John", "StudentMathScore" : 57 } { "_id" : ObjectId("5ca281f56304881c5ce84ba6"), "StudentName" : "Larry", "StudentMathScore" : 89 } { "_id" : ObjectId("5ca281fd6304881c5ce84ba7"), "StudentName" : "Chris", "StudentMathScore" : 98 } { "_id" : ObjectId("5ca2820a6304881c5ce84ba8"), "StudentName" : "Robert", "StudentMathScore" : 99 } { "_id" : ObjectId("5ca282206304881c5ce84ba9"), "StudentName" : "Bob", "StudentMathScore" : 97 }
Following is the query that represents the equivalent of where in MongoDB with $in operator:
> db.whereInDemo.find({StudentMathScore:{$in:[97,98,99]}}).pretty();
This will produce the following output
{ "_id" : ObjectId("5ca281fd6304881c5ce84ba7"), "StudentName" : "Chris", "StudentMathScore" : 98 } { "_id" : ObjectId("5ca2820a6304881c5ce84ba8"), "StudentName" : "Robert", "StudentMathScore" : 99 } { "_id" : ObjectId("5ca282206304881c5ce84ba9"), "StudentName" : "Bob", "StudentMathScore" : 97 }
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