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 ...

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

📅 Date functions confuse almost every Data Engineer at some point. Same concept. Different syntax. Depending on whether you're working in SQL, Spark SQL, PySpark, or Python, the function name changes ...