To find value in the array with multiple criteria, for example, you can use $elemMatch along with $gt and $lt. The syntax is as follows −
db.yourCollectionName.find({yourFieldName:{$elemMatch:{$gt:yourNegativeValue,$lt:yourPo sitiveValue}}}).pretty();
To understand the above syntax, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.findValueInArrayWithMultipleCriteriaDemo.insertOne({"StudentName":"Larry","StudentMarks":[-150,150]}); { "acknowledged" : true, "insertedId" : ObjectId("5c77daf6fc4e719b197a12f5") } > db.findValueInArrayWithMultipleCriteriaDemo.insertOne({"StudentName":"Mike","StudentMarks":[19]}); { "acknowledged" : true, "insertedId" : ObjectId("5c77db09fc4e719b197a12f6") }
Display all documents from a collection with the help of find() method. The query is as follows −
> db.findValueInArrayWithMultipleCriteriaDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c77daf6fc4e719b197a12f5"), "StudentName" : "Larry", "StudentMarks" : [ -150, 150 ] } { "_id" : ObjectId("5c77db09fc4e719b197a12f6"), "StudentName" : "Mike", "StudentMarks" : [ 19 ] }
Here is the query to find value in the array with multiple criteria. For example, here we are considering marks greater than -20 and less than 20 −
> db.findValueInArrayWithMultipleCriteriaDemo.find({StudentMarks:{$elemMatch:{$gt:-20,$lt:20}}}).pretty();
The following is the output −
{ "_id" : ObjectId("5c77db09fc4e719b197a12f6"), "StudentName" : "Mike", "StudentMarks" : [ 19 ] }