Databases Articles
Databases power application data. Here you will find content on SQL and NoSQL fundamentals, schema design and modeling, indexing strategies, joins and aggregations, transactions, performance tuning, backups, and production best practices across MongoDB, PostgreSQL, and more.
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How to Perform JOIN in MongoDB Using $lookup
Understand MongoDB's $lookup to join collections, with examples for basic joins, flattening with $unwind, and filtering with additional stages.- Published on
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