In this video, we solve a common SQL interview question where data is stored across multiple tables. The company maintains customer information in one table and order details in another. Using an UPDATE statement with JOINs, we calculate each customer’s total order amount and update their MembershipLevel accordingly.
Problem Statement:
If a customer’s total order amount is greater than 1000, update their MembershipLevel to 'Gold'
Otherwise, keep their MembershipLevel as 'Regular'
Key Concepts Covered:
UPDATE with JOINs
Aggregation using SUM()
GROUP BY and HAVING clauses
Real-world SQL interview scenario
Conditional updates across multiple tables
This video is perfect for anyone preparing for SQL interviews, learning JOIN-based updates, or working with real-world relational database scenarios.
