SQL Blog

The SQL Reference blog publishes 30 long-form articles about how SQL really works — not quick listicles but deep dives with real queries, covering joins, indexing, window functions, query performance, and the design decisions behind relational databases. Every article is written to stand on its own, with full explanations and runnable examples, and links out to the relevant reference pages when it mentions a specific statement so you can check syntax details as you read. Articles include SQL JOINs: A Complete Visual Guide, SQL Indexes: When and How to Use Them, SQL Window Functions: Practical Examples for Real Problems, SQL Normalization: From 1NF to 3NF with Real Examples, SQL Query Optimization: Techniques That Actually Work, SQL Subqueries: Patterns for Nested Queries That Stay Readable, SQL CTEs: Common Table Expressions for Readable Complex Queries, SQL Transactions and Isolation Levels: A Practical Guide. Articles pair well with the topic guides for structured learning and with the A–Z reference when you need exact syntax. You can run every query from the articles in the SQL playground without installing anything.