In Chapter 3, , you learned about indexing, as well as about PostgreSQL's ability to run custom indexing code to speed up queries. In this chapter, you will learn about advanced SQL. Most of the people who read this book will have some experience of using SQL. However, experience has shown that the advanced features outlined in this book are not widely known and therefore it makes sense to cover them in this context to help people achieve their goals faster and more efficiently. There has been a long discussion on whether the database is just a simple data store or whether business logic should be in the database or not. Maybe this chapter will shed some light and show how capable a modern relational database really is.
This chapter is about modern SQL and its features. A variety of different and sophisticated SQL features are included...