MySQL & SQL Blog
Practical articles about MySQL, SQL, and database development. Guides, examples, and real-world patterns for developers.
MySQL vs PostgreSQL: Which Should You Learn in 2026?
A practical comparison of MySQL and PostgreSQL based on real-world usage, not marketing pages. Which database is actually better for your next project?
10 Common SQL Mistakes Beginners Make (And How to Fix Them)
These 10 mistakes appear in beginner SQL queries repeatedly. Here is how to spot and fix each one.
Complete Guide to SQL JOINs with Visual Examples
INNER, LEFT, RIGHT, FULL, CROSS, self-joins. Every JOIN type explained with diagrams, examples, and the exact situations where each one matters.
How to Visualize Your MySQL Schema with an ERD Diagram
Learn how to read and create Entity-Relationship Diagrams using Crow's foot notation. A practical guide to visualizing MySQL schemas.
How to Optimize MySQL Query Performance
Slow queries are the number one performance bottleneck in MySQL applications. Here is how to find them, understand why they are slow, and fix them.
Window Functions vs GROUP BY: When to Use Each
Both calculate aggregates, but they work in fundamentally different ways. Understanding the difference will change how you write queries.
MySQL Data Types Explained: Choosing the Right Column Type
VARCHAR(255) is not always the answer. Here is how to pick the right data type for every column in your MySQL schema.
Introduction to Database Indexing: Why It Matters
An index is the single most impactful feature in any database. Here is how B-trees work, when to add indexes, and when not to.
SQL Injection Prevention: Every Developer Needs to Know This
SQL injection is the most common web attack vector and the most preventable. Here is how parameterized queries work and why string concatenation kills.
MySQL vs SQLite: Which Database for Your Project?
One runs on a server with thousands of connections. The other runs inside your app. Here is how to choose.
Learning SQL in 2026: The Complete Roadmap
Where to start, what to learn first, and how to practice effectively. A practical guide based on what actually works, not what sounds good in a blog post.
MySQL Stored Procedures vs Functions: When to Use Which
Both encapsulate logic inside the database, but they serve different purposes. One returns a value. The other does not. Here is when to use each.
Understanding MySQL Transaction Isolation Levels
READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, SERIALIZABLE. Each one trades consistency for performance. Here is exactly what changes at each level.
Optimizing Slow Queries in Production MySQL
What works in development does not always work in production. These common patterns cause 10x slowdowns in production MySQL. Here is how to fix them.
SQL Security Best Practices for Developers
Most SQL injection guides stop at "use parameterized queries." Here is the full picture: least privilege, input validation, encryption, auditing, and more.
MySQL Replication: A Practical Guide
Primary-replica replication is how most MySQL deployments handle read scaling and high availability. Here is how to set it up and what to watch out for.
JSON in MySQL: A Complete Guide
MySQL 8.4 has solid JSON support, but it is not PostgreSQL. Here is what works well, what to avoid, and when you should just use a separate table.
New to SQL? Start with the tutorials.