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Perform min/max with MongoDB aggregation
For min/max in MongoDB, use $min and $max. Let us create a collection with documents −
> db.demo251.insertOne({"Marks":78}); { "acknowledged" : true, "insertedId" : ObjectId("5e46c0001627c0c63e7dba74") } > db.demo251.insertOne({"Marks":87}); { "acknowledged" : true, "insertedId" : ObjectId("5e46c0031627c0c63e7dba75") } > db.demo251.insertOne({"Marks":56}); { "acknowledged" : true, "insertedId" : ObjectId("5e46c0061627c0c63e7dba76") } > db.demo251.insertOne({"Marks":76}); { "acknowledged" : true, "insertedId" : ObjectId("5e46c00c1627c0c63e7dba77") }
Display all documents from a collection with the help of find() method −
> db.demo251.find();
This will produce the following output −
{ "_id" : ObjectId("5e46c0001627c0c63e7dba74"), "Marks" : 78 } { "_id" : ObjectId("5e46c0031627c0c63e7dba75"), "Marks" : 87 } { "_id" : ObjectId("5e46c0061627c0c63e7dba76"), "Marks" : 56 } { "_id" : ObjectId("5e46c00c1627c0c63e7dba77"), "Marks" : 76 }
Following is the query to implement min/max aggregation in MongoDB −
> db.demo251.aggregate([ ... { "$group": { ... "_id": null, ... "MaxMarks": { "$max": "$Marks" }, ... "MinMarks": { "$min": "$Marks" } ... }} ...])
This will produce the following output −
{ "_id" : null, "MaxMarks" : 87, "MinMarks" : 56 }
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