Engineer Tang's Implementation Study Notes

Jan 6, 2026 · Databases

SQL Fundamentals: CRUD, Joins & Execution Order Explained for Beginners

This tutorial explains SQL fundamentals including CRUD operations, the difference between SELECT * and explicit columns, table and column aliases, INNER/LEFT/RIGHT JOIN types with practical examples, and the SQL execution order (FROM/JOIN → WHERE → GROUP BY → HAVING → SELECT → ORDER BY → LIMIT) using a cooking analogy, plus beginner tips.