The original title is "SQL Basics Explained: DDL, DML, Filtering, and CASE WHEN"

Short summary

A beginner-friendly SQL tutorial using a school database example to explain DDL (CREATE, ALTER, DROP), DML (INSERT, UPDATE, DELETE), filtering with WHERE and comparison operators, and pattern matching with BETWEEN, IN, and LIKE. Covers primary keys, foreign keys, SERIAL auto-increment, and aggregate functions like COUNT, SUM, AVG, MIN, and MAX. Each concept includes annotated code examples and common beginner pitfalls.

• •DDL defines table structure; DML populates and modifies data
• •WHERE clauses are essential for UPDATE and DELETE to avoid affecting all rows
• •Aggregate functions like COUNT and SUM summarize data across rows

Generated with AI, which can make mistakes.