- A JOIN is used to combine data from multiple tables based on a related column.
- It is required when business data is split across different tables.
- Joins help create a complete dataset for analysis and reporting.
- In my project, we joined sales, customers, and product tables.
- This allowed us to analyze revenue by customer and product.
- Without JOINs, data would remain fragmented and less useful.
- They are essential during extraction to build meaningful analytical views.
What is a JOIN and why is it required during data extraction?
Updated on January 8, 2026
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