Databases & SQL
SQL and NoSQL databases from first query to design: PostgreSQL, MySQL, MongoDB and vector search for AI.
Beginner
Start here. No background needed beyond school maths.
Document
Beginner
↗ External site
Getting Started with MongoDB
MongoDB's official first-steps guide to document databases: inserting, querying and updating JSON-like documents. Useful background for AI apps that store unstructured data.
MongoDB
Document
Beginner
↗ External site
PostgreSQL Tutorial (Official Documentation)
The official PostgreSQL tutorial: the SQL language, tables, queries, joins and transactions, written by the PostgreSQL team.
PostgreSQL Global Development Group