Lesson 1. Understanding SQL
In this lesson, you’ll learn about databases and SQL, prerequisites to learning about Oracle and PL/SQL.
Database Basics
The fact that you are reading this book indicates that you, somehow, need to interact with databases. And so before diving into Oracle and its implementation of the SQL language (PL/SQL), it is important that you understand some basic concepts about databases and database technologies.
Whether you are aware of it or not, you use databases all the time. Each time you select a name from your email or smartphone address book, you use a database. When you conduct a search on an Internet search site, you use a database. When you log in to your network at work, you validate your name and password against ...
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