In this form of the query results of different In this type of queries the results of several partial queries are merged and grouped together to form a new result. The following query returns a list of all the US states, which that have more than 10 million inhabitants.
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The queries must be embedded in an array. Will Are the appropriate brackets forgotten, this braces left out, it leads to an error message. |
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A detailed documentation toof the Mongo aggregation framework can be found here: http://docs.mongodb.org/manual/core/aggregation-introduction/ |