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Get distinct values from a column in MongoDB?
To get distinct values from a column, use distinct() in MongoDB. Let us first create a collection with documents −
> db.demo128.insertOne({"Name":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e30583d68e7f832db1a7f5d") } > db.demo128.insertOne({"Name":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e30584068e7f832db1a7f5e") } > db.demo128.insertOne({"Name":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e30584368e7f832db1a7f5f") } > db.demo128.insertOne({"Name":"Bob"}); { "acknowledged" : true, "insertedId" : ObjectId("5e30584668e7f832db1a7f60") } > db.demo128.insertOne({"Name":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e30584c68e7f832db1a7f61") }
Display all documents from a collection with the help of find() method −
> db.demo128.find();
This will produce the following output −
{ "_id" : ObjectId("5e30583d68e7f832db1a7f5d"), "Name" : "Chris" } { "_id" : ObjectId("5e30584068e7f832db1a7f5e"), "Name" : "David" } { "_id" : ObjectId("5e30584368e7f832db1a7f5f"), "Name" : "David" } { "_id" : ObjectId("5e30584668e7f832db1a7f60"), "Name" : "Bob" } { "_id" : ObjectId("5e30584c68e7f832db1a7f61"), "Name" : "Chris" }
Following is the query to get distinct values from a column in MongoDB −
> db.demo128.distinct("Name");
This will produce the following output −
[ "Chris", "David", "Bob" ]
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