MySQL relational database. Covers queries, indexes, and optimization.
Use when working with MySQL databases.
USE WHEN: user mentions "mysql", "mariadb", asks about "AUTO_INCREMENT",
"ON DUPLICATE KEY UPDATE", "GROUP_CONCAT", "mysql specific syntax"
DO NOT USE FOR: PostgreSQL - use `postgresql` instead, MongoDB - use `mongodb` instead,
Oracle - use `oracle` instead, SQL Server - use `sqlserver` instead