Day 76 of Learning MERN Stack

On day 76 of a 100-day full-stack engineering streak, the developer transitioned from NoSQL databases like MongoDB to Relational Databases, focusing on the architectural differences between flexible structures and optimized tables. By day 81, the focus shifted to database analytics and reporting. The developer mastered the GROUP BY clause, the HAVING clause, and categorical data aggregations to process e-commerce telemetry and payment services, transforming flat datasets into meaningful summaries for better relational insights.