🚀 SQL Essentials for Data Engineers:

Joins & Subqueries – Master INNER, LEFT, RIGHT, CROSS joins.

Window Functions – Use ROW_NUMBER(), RANK(), LAG() for analytics.

CTEs & Temp Tables – Write cleaner queries with WITH.

Performance Tuning – Optimize with indexes & execution plans.

ACID Transactions – Ensure consistency with COMMIT & ROLLBACK.

Normalization – Balance efficiency with normal vs. denormal forms.

Master these, and you're golden! 💡

#SQL #DataEngineering