# PostgreSQL The big [[SQL]] [[Relational Databases|Relational]] [[Databases|Database]] that could. ## Links About [[PostgreSQL]] internals: - [The Internals of PostgreSQL : Chapter 3 Query Processing](http://www.interdb.jp/pg/pgsql03.html) - [PostgreSQL 14 Internals : Postgres Professional](https://postgrespro.com/community/books/internals)