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Fetch specific multiple documents in MongoDB
To fetch specific multiple documents in MongoDB, use $in. Let us create a collection with documents −
> db.demo593.insertOne({id:1,"Name":"Chris"});{
"acknowledged" : true, "insertedId" : ObjectId("5e93177dfd2d90c177b5bcd9")
}
> db.demo593.insertOne({id:2,"Name":"John"});{
"acknowledged" : true, "insertedId" : ObjectId("5e931785fd2d90c177b5bcda")
}
> db.demo593.insertOne({id:3,"Name":"Bob"});{
"acknowledged" : true, "insertedId" : ObjectId("5e93178cfd2d90c177b5bcdb")
}
> db.demo593.insertOne({id:4,"Name":"Sam"});{
"acknowledged" : true, "insertedId" : ObjectId("5e931792fd2d90c177b5bcdc")
}Display all documents from a collection with the help of find() method −
> db.demo593.find();
This will produce the following output −
{ "_id" : ObjectId("5e93177dfd2d90c177b5bcd9"), "id" : 1, "Name" : "Chris" }
{ "_id" : ObjectId("5e931785fd2d90c177b5bcda"), "id" : 2, "Name" : "John" }
{ "_id" : ObjectId("5e93178cfd2d90c177b5bcdb"), "id" : 3, "Name" : "Bob" }
{ "_id" : ObjectId("5e931792fd2d90c177b5bcdc"), "id" : 4, "Name" : "Sam" }Following is the query to fetch specific multiple documents −
> db.demo593.find({id:{$in:[1,3]}});This will produce the following output −
{ "_id" : ObjectId("5e93177dfd2d90c177b5bcd9"), "id" : 1, "Name" : "Chris" }
{ "_id" : ObjectId("5e93178cfd2d90c177b5bcdb"), "id" : 3, "Name" : "Bob" }
Updated on: 15-May-2020
351 Views
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