Beginning SQL Queries: From Novice to Professional, Second Edition

© Clare Churcher 2016

Clare Churcher, Beginning SQL Queries, 10.1007/978-1-4842-1955-3_1

1. Relational Database Overview

Clare Churcher¹ 

(1)Studio B Productions, Great Neck, New York, USA

Electronic supplementary material

The online version of this chapter (doi:10.​1007/​978-1-4842-1955-3_​1) contains supplementary material, which is available to authorized users.

SQL (Structured Query Language) enables us to create tables, apply constraints, and manipulate data in a database. In this book we will concentrate on queries that allow us to extract information from a database by describing the subset of data we need. That data might be a single number , such as a product price, a list of the names of members with overdue subscriptions, or a calculation, ...