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Lets say one of my items in a collection looks like that:

{ User:123 Grade : 100 }

I want to sum up the grades for each student so i have this output:

123: 100, 445: 30 etc

Im normal sql, its the equivalent of a group by + sum() query. How can i do it with mongo?

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You will have to use the mongodb aggregation framework.

Check this example: https://docs.mongodb.org/manual/tutorial/aggregation-zip-code-data-set/

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