This is one of the free download chapters of the book, you can get your free copy from Appendix C SQL Primer free download
This chapter highlights the more or less ANSI/ISO SQL Compliant features of PostgreSQL. It introduces the basic concepts of SQL. For those familiar with SQL already, it showcases some of the high-level ANSI SQL features that PostgreSQL supports that you would expect of an enterprise relational database.
pgRouting: A Practical Guide is available in Hardcopy from Hardcopy from Amazon. E-Book or Bulk discounts on Hard-copy from Locate Press.