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Get Absolute value with MongoDB aggregation framework?
You can use $abs operator for this. Let us first create a collection with documents
> db.absoluteValueDemo.insert({"Value":98}); WriteResult({ "nInserted" : 1 }) > db.absoluteValueDemo.insert({"Value":-100}); WriteResult({ "nInserted" : 1 }) > db.absoluteValueDemo.insert({"Value":0}); WriteResult({ "nInserted" : 1 }) > db.absoluteValueDemo.insert({"Value":-9999990}); WriteResult({ "nInserted" : 1 })
Following is the query to display all documents from a collection with the help of find() method:
> db.absoluteValueDemo.find().pretty();
This will produce the following output
{ "_id" : ObjectId("5ca271f56304881c5ce84b9a"), "Value" : 98 } { "_id" : ObjectId("5ca271fa6304881c5ce84b9b"), "Value" : -100 } { "_id" : ObjectId("5ca271fe6304881c5ce84b9c"), "Value" : 0 } { "_id" : ObjectId("5ca2720f6304881c5ce84b9d"), "Value" : -9999990 }
Following is the query to get absolute value with MongoDB aggregation framework
> db.absoluteValueDemo.aggregate({ $project: { AbsoluteValue: { $abs: '$Value' } }});
This will produce the following output
{ "_id" : ObjectId("5ca271f56304881c5ce84b9a"), "AbsoluteValue" : 98 } { "_id" : ObjectId("5ca271fa6304881c5ce84b9b"), "AbsoluteValue" : 100 } { "_id" : ObjectId("5ca271fe6304881c5ce84b9c"), "AbsoluteValue" : 0 } { "_id" : ObjectId("5ca2720f6304881c5ce84b9d"), "AbsoluteValue" : 9999990 }
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