SQL Basics Explained: DDL, DML, Filtering, and CASE WHEN

This article explains SQL basics, covering DDL (data definition language), DML (data manipulation language), filtering, and CASE WHEN. It uses a school database example to illustrate key concepts and syntax. Key takeaways include understanding table creation, data types, primary and foreign keys, and how to insert, update, and delete data. The article emphasizes the importance of using WHERE clauses with UPDATE and DELETE commands to avoid affecting entire tables.