Top 3 SQL Interview Questions You Must Know (With Answers)

Covers three SQL interview questions commonly asked in data science, analytics, and engineering roles. Problem 1 involves filtering purchases by date and return status using GROUP BY and HAVING. Problem 2 requires window functions (RANK), outer joins, and aggregation to find each customer's latest order summary. Problem 3 is the most complex, requiring CTEs or self-joins to identify customers active across specific years with different monthly order thresholds. Two solutions are shown for Problem 3: a multi-CTE approach and a more efficient single-CTE with self-join. The video also promotes an upcoming SQL bootcamp.