Introduction

Relational databases have become the most common data storage mechanism for modern computer applications. Programming languages such as Java, C, and COBOL, and scripting languages such as Perl, VBScript, and JavaScript must often access a data source in order to retrieve or modify data. Many of these data sources are managed by a relational database management system (RDBMS), such as Oracle, Microsoft SQL Server, MySQL, and DB2, that relies on the Structured Query Language (SQL) to create and alter database objects, add data to and delete data from the database, modify data that has been added to that database, and, of course, retrieve data stored in the database for display and processing.

SQL is the most widely implemented language ...

Get SQL: A Beginner's Guide, Fourth Edition, 4th Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.