Merge Similar Collections with $unionWith
Discover how to use the $unionWith operator to merge documents from multiple MongoDB collections into a single aggregation pipeline. Learn to combine datasets with similar schemas for unified analysis, calculate total revenue across collections, and manage data by copying and deleting documents safely.
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We'll cover the following...
The $unionWith operator in MongoDB is a powerful feature that allows us to combine the results of multiple collections into a single aggregation pipeline. This is especially useful when we have multiple collections with similar schemas and want to analyze or report on them as if they were a single dataset.
Setting up
Up until ...