These SQL patterns are frequently used in real-world scenarios such as: • Customer segmentation • Sales trend analysis • Cohort analysis • Data cleaning and transformation • Ranking and performance ...

-- product_id is the primary key for this table. -- period_start and period_end indicates the start and end date for sales period, both dates are inclusive. -- The average_daily_sales column holds the ...

You don't need a data engineering degree to be dangerous with SQL. You need five queries you trust — ones you can pull up at 9 AM before a leadership meeting and actually answer something. Here are ...

- Inserts transformed and cleansed data from Bronze into Silver tables.