In short
MongoDB's framework for transforming and analyzing data through a sequence of stages (`$match`, `$group`, `$sort`) — the NoSQL equivalent of complex SQL queries.
How to learn this
- 1Build a pipeline that groups documents and computes a sum or average.
- 2Chain `$match` and `$group` stages to filter before aggregating.
- 3Compare an aggregation pipeline to the equivalent SQL `GROUP BY` query.
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