coder: mongodb count and sum array size after a group/aggregation
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mongoose - Get record count based upon Group, mongodb - Stack Overflow
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mongodb - Mongo db Group by, count with a condition - Stack Overflow
MongoDB Europe 2018 - Chris De Bruyne, Nick Van Hoof and Jan Van der Veken — Ordina JWorks Tech Blog
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Precog & MongoDB User Group: Skyrocket Your Analytics
Group by and count MongoDB documents by a specific field - Stack Overflow
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Help creating $group and $count query - Working with Data - MongoDB Developer Community Forums
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MongoDB group by | How group by works in MongoDB | Examples
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19 Aggregation Example 9 $group and $count - MongoDB Aggregation Tutorial - YouTube
