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How to compare multiple properties in MongoDB?\n
To compare multiple properties, use $where in MongoDB. Let us create a collection with documents −
> db.demo223.insertOne({"Scores":[56,78]}); { "acknowledged" : true, "insertedId" : ObjectId("5e3ee4ca03d395bdc2134730") } > db.demo223.insertOne({"Scores":[88,45]}); { "acknowledged" : true, "insertedId" : ObjectId("5e3ee4d103d395bdc2134731") } > db.demo223.insertOne({"Scores":[98,79]}); { "acknowledged" : true, "insertedId" : ObjectId("5e3ee4d803d395bdc2134732") }
Display all documents from a collection with the help of find() method −
> db.demo223.find();
This will produce the following output −
{ "_id" : ObjectId("5e3ee4ca03d395bdc2134730"), "Scores" : [ 56, 78 ] } { "_id" : ObjectId("5e3ee4d103d395bdc2134731"), "Scores" : [ 88, 45 ] } { "_id" : ObjectId("5e3ee4d803d395bdc2134732"), "Scores" : [ 98, 79 ] }
Following is the query to compare multiple properties in MongoDB −
> db.demo223.find({ $where : "this.Scores[0] > this.Scores[1]" });
This will produce the following output −
{ "_id" : ObjectId("5e3ee4d103d395bdc2134731"), "Scores" : [ 88, 45 ] } { "_id" : ObjectId("5e3ee4d803d395bdc2134732"), "Scores" : [ 98, 79 ] }
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