Databases

Databases.

Design, query, and operate modern databases — schema design, indexing, transactions, and performance engineering.

Beginner

Start here — no prior experience needed

1 lesson

Learn how to model data, choose keys, define relationships, and create a schema that supports reliable queries.

For developers with core concepts down

1 lesson

Design useful indexes and understand transactional guarantees: isolation levels, atomicity, and consistency tradeoffs.

Production-grade patterns for experienced engineers

1 lesson

Use EXPLAIN plans, statistics, indexes, and query rewrites to improve latency and throughput with safe tradeoffs.