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Compare multiple properties in MongoDB?
To compare multiple properties, use the $where operator. Let us first create a collection with documents −
> dbcomparingMultiplePropertiesDemoinsertOne({"Values":[10,70,60]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cf228fcb64a577be5a2bc0a")
}Following is the query to display all documents from a collection with the help of find() method −
> dbcomparingMultiplePropertiesDemofind()pretty();
This will produce the following document −
{
"_id" : ObjectId("5cf228fcb64a577be5a2bc0a"),
"Values" : [
10,
70,
60
]
}Case 1: If condition becomes true then you will get an array otherwise nothing will get displayed Following is the query to compare multiple properties in MongoDB.
> dbcomparingMultiplePropertiesDemofind({ $where : "thisValues[1] > thisValues[2]" });This will produce the following document since 70 > 60 −
{ "_id" : ObjectId("5cf228fcb64a577be5a2bc0a"), "Values" : [ 10, 70, 60 ] }
Case 2: If condition becomes false then nothing will get displayed Following is the query to compare multiple properties in MongoDB −
> dbcomparingMultiplePropertiesDemofind({ $where : "thisValues[1] < thisValues[2]" });For false condition, data won’t get displayed since 70 < 60 is false.
Updated on: 30-Jul-2019
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