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MySQL

MySQL is the world's most widely deployed open-source relational database, powering web applications from WordPress sites to Facebook-scale platforms. Its reliability, performance, and broad ecosystem make MySQL skills foundational for any backend developer or database professional.

What is MySQL?

MySQL provides ACID-compliant transactions, complex JOINs, stored procedures, triggers, full-text search, and JSON column support. It's available as open source (GPL), commercial Oracle MySQL, and forks like MariaDB and Percona Server. Managed cloud services (AWS RDS MySQL, Google Cloud SQL, PlanetScale) make MySQL deployments operationally simpler. Key skills include query optimisation, indexing strategy (B-tree, full-text), replication setup (primary-replica), and schema design.

Why MySQL matters for your career

MySQL underpins a disproportionate share of the world's web applications — particularly those built on PHP (WordPress, Drupal, Magento), Java, and Python frameworks. Understanding MySQL deeply — writing efficient queries, designing normalised schemas, managing indexes — is a core backend engineering skill with universal applicability.

Career paths using MySQL

MySQL skills are expected of Backend Developer, Full-Stack Developer, Database Administrator (DBA), and Data Engineer roles. WordPress/PHP developers particularly rely on MySQL expertise.

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Frequently asked questions

MySQL vs. PostgreSQL — which should I learn?▼

Both are excellent relational databases. PostgreSQL has a richer feature set (better JSON support, more advanced types, JSONB indexing) and is preferred for complex applications. MySQL has slightly simpler replication and broad hosting support. Learning SQL concepts in one transfers to the other.

What's the most important performance concept in MySQL?▼

Index selection. Using EXPLAIN to understand query plans and ensuring queries hit appropriate indexes rather than performing full table scans is the single most impactful performance optimisation for the vast majority of MySQL workloads.