MySQL
Wikibooks
An open guide to MySQL from installation to administration. Covers the query language, table types, stored programs, replication, optimization, and connecting from PHP and other APIs.
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Databases: MySQL IntroductionA course workbook with step-by-step exercises. You set up a MySQL server, create databases and tables, write queries, link tables with keys, and manage users and privileges.
Verified PDF · Secure download - Postgres: The First Experience
A small book for your first steps with PostgreSQL. It covers installation on Linux and Windows, writing queries on a demo database, transactions, basic server setup, and useful extensions.
Verified PDF · Secure download - PostgreSQL Notes for Professionals
A compact reference with working examples: data types, window functions, common table expressions, JSON support, triggers, PL/pgSQL, backups, roles, and high availability.
Verified PDF · Secure download - PostgreSQL 14 Internals
A deep look at how PostgreSQL works under the hood. It explains isolation and MVCC, the buffer cache and WAL, locks, query execution and planning, and every index type from B-tree to BRIN.
Verified PDF · Secure download - PostgreSQL 17 Documentation
The official PostgreSQL manual in a single file. It includes the tutorial, the full SQL language reference, server administration, client interfaces, and server programming.
Verified PDF · Secure download
