MySQL

MySQL is a widely used relational database management system (RDBMS). It is the "M" in the LAMP stack and powers huge platforms like Facebook and WordPress.

When to Use

• Web Application Relational Backbone: The world's most popular open-source relational database powering WordPress, Rails, and web backends.
• ACID Transaction Guarantees: Processing financial transactions, order checkouts, and inventory balances reliably with InnoDB.
• Read-Heavy Web Applications: Scaling reads horizontally using primary-replica asynchronous and semi-synchronous replication topologies.
• Modern Document Store (JSON Columns): Indexing and querying semi-structured JSON documents alongside relational SQL tables.

Quick Start

-- Upsert (Insert or Update)
INSERT INTO users (id, name) VALUES (1, 'Jane')
ON DUPLICATE KEY UPDATE name = 'Jane';