Set of tips for geospatial analysis in relational databases.
Free books: SQL https://github.com/vhf/free-programming-books/blob/master/free-programming-books.md#sql-implementation-agnostic PostgreSQL https://github.com/vhf/free-programming-books/blob/master/free-programming-books.md#postgresql SQL Server https://github.com/vhf/free-programming-books/blob/master/free-programming-books.md#sql-server Oracle 12.2 http://docs.oracle.com/database/122/nav/portal_booklist.htm