Учебник Postgresql
PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. PostgreSQL runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows. This Learn Postgresql Full will give you quick start with PostgreSQL and make you comfortable with PostgreSQL programming.
This Learn Postgresql Full has been prepared for the beginners to help them understand the basic to advanced concepts related to PostgreSQL Database.
Before you start practicing with various types of examples given in this reference, I'm making an assumption that you are already aware of what a database is, especially RDBMS and what a computer language is.