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Display Distinctly Ordered MongoDB Records with Skip and Limit
You can work with aggregate framework and use $sort, $skip and $limit to display distinctly ordered records with skip and also set the limit. Let us first create a collection with documents
> db.orderedDistinctDemo.insertOne({"Name":"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8e0140b992277dae0e9") } > db.orderedDistinctDemo.insertOne({"Name":"Larry"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8e5140b992277dae0ea") } > db.orderedDistinctDemo.insertOne({"Name":"Larry"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8e7140b992277dae0eb") } > db.orderedDistinctDemo.insertOne({"Name":"Sam"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8ea140b992277dae0ec") } > db.orderedDistinctDemo.insertOne({"Name":"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8ee140b992277dae0ed") } > db.orderedDistinctDemo.insertOne({"Name":"Carol"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8f2140b992277dae0ee") } > db.orderedDistinctDemo.insertOne({"Name":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8f6140b992277dae0ef") } > db.orderedDistinctDemo.insertOne({"Name":"Carol"}); { "acknowledged" : true, "insertedId" : ObjectId("5ccfb8f9140b992277dae0f0") }
Following is the query to display all documents from a collection with the help of find() method −
> db.orderedDistinctDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5ccfb8e0140b992277dae0e9"), "Name" : "John" } { "_id" : ObjectId("5ccfb8e5140b992277dae0ea"), "Name" : "Larry" } { "_id" : ObjectId("5ccfb8e7140b992277dae0eb"), "Name" : "Larry" } { "_id" : ObjectId("5ccfb8ea140b992277dae0ec"), "Name" : "Sam" } { "_id" : ObjectId("5ccfb8ee140b992277dae0ed"), "Name" : "John" } { "_id" : ObjectId("5ccfb8f2140b992277dae0ee"), "Name" : "Carol" } { "_id" : ObjectId("5ccfb8f6140b992277dae0ef"), "Name" : "David" } { "_id" : ObjectId("5ccfb8f9140b992277dae0f0"), "Name" : "Carol" }
Here is the query to display distinctly ordered record with skip and limit −
> db.orderedDistinctDemo.aggregate( ... { $group : { _id : "$Name" }}, ... { $sort : { _id: 1 }}, ... { $skip : 3 }, ... { $limit : 8 } ... );
This will produce the following output −
{ "_id" : "Larry" } { "_id" : "Sam" }
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