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MongoDB query to select 10 most recent documents without changing order?
For this, use skip() in MongoDB. Under skip(), set “count() – 10” to get 10 most recent documents. Let us create a collection with documents −
> db.demo500.insertOne({value:10});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749c5987b6e0e9d18f55a")
}
> db.demo500.insertOne({value:1200});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749c8987b6e0e9d18f55b")
}
> db.demo500.insertOne({value:19});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749cb987b6e0e9d18f55c")
}
> db.demo500.insertOne({value:28});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749cf987b6e0e9d18f55d")
}
> db.demo500.insertOne({value:50});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749d1987b6e0e9d18f55e")
}
> db.demo500.insertOne({value:70});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749d4987b6e0e9d18f55f")
}
> db.demo500.insertOne({value:100});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749d7987b6e0e9d18f560")
}
> db.demo500.insertOne({value:10});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749d9987b6e0e9d18f561")
}
> db.demo500.insertOne({value:98});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749dc987b6e0e9d18f562")
}
> db.demo500.insertOne({value:80});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8749e0987b6e0e9d18f563")
}
> db.demo500.insertOne({value:75});{
"acknowledged" : true,
"insertedId" : ObjectId("5e874c73987b6e0e9d18f564")
}
> db.demo500.insertOne({value:68});{
"acknowledged" : true,
"insertedId" : ObjectId("5e874c78987b6e0e9d18f565")
}
Display all documents from a collection with the help of find() method −
> db.demo500.find();
This will produce the following output −
{ "_id" : ObjectId("5e8749c5987b6e0e9d18f55a"), "value" : 10 }
{ "_id" : ObjectId("5e8749c8987b6e0e9d18f55b"), "value" : 1200 }
{ "_id" : ObjectId("5e8749cb987b6e0e9d18f55c"), "value" : 19 }
{ "_id" : ObjectId("5e8749cf987b6e0e9d18f55d"), "value" : 28 }
{ "_id" : ObjectId("5e8749d1987b6e0e9d18f55e"), "value" : 50 }
{ "_id" : ObjectId("5e8749d4987b6e0e9d18f55f"), "value" : 70 }
{ "_id" : ObjectId("5e8749d7987b6e0e9d18f560"), "value" : 100 }
{ "_id" : ObjectId("5e8749d9987b6e0e9d18f561"), "value" : 10 }
{ "_id" : ObjectId("5e8749dc987b6e0e9d18f562"), "value" : 98 }
{ "_id" : ObjectId("5e8749e0987b6e0e9d18f563"), "value" : 80 }
{ "_id" : ObjectId("5e874c73987b6e0e9d18f564"), "value" : 75 }
{ "_id" : ObjectId("5e874c78987b6e0e9d18f565"), "value" : 68 }
Following is the query to select 10 most recent documents without changing the order −
> db.demo500.find().skip(db.demo500.count() - 10);
This will produce the following output −
{ "_id" : ObjectId("5e8749cb987b6e0e9d18f55c"), "value" : 19 }
{ "_id" : ObjectId("5e8749cf987b6e0e9d18f55d"), "value" : 28 }
{ "_id" : ObjectId("5e8749d1987b6e0e9d18f55e"), "value" : 50 }
{ "_id" : ObjectId("5e8749d4987b6e0e9d18f55f"), "value" : 70 }
{ "_id" : ObjectId("5e8749d7987b6e0e9d18f560"), "value" : 100 }
{ "_id" : ObjectId("5e8749d9987b6e0e9d18f561"), "value" : 10 }
{ "_id" : ObjectId("5e8749dc987b6e0e9d18f562"), "value" : 98 }
{ "_id" : ObjectId("5e8749e0987b6e0e9d18f563"), "value" : 80 }
{ "_id" : ObjectId("5e874c73987b6e0e9d18f564"), "value" : 75 }
{ "_id" : ObjectId("5e874c78987b6e0e9d18f565"), "value" : 68 }
Updated on: 2020-05-13T06:01:32+05:30
177 Views
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