MongoDB update many with switch fails - The dollar ($) prefixed field '$ switch' in 'offerCategoryState.$switch' is not valid for storage - Stack Overflow
A MongoDB Aggregation Example with $match, $group & $sort
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MongoDB Tutorial Day 4: Aggregation - CodeProject
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How to Handle Advanced Data Processing with MongoDB's Aggregation Framework
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How to Handle Advanced Data Processing with MongoDB's Aggregation Framework
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What is Aggregation in MongoDB with example
What is Aggregation in MongoDB with example
MongoDB Aggregation Framework: How to simplify complex logic into stages