Book Image

The MySQL Workshop

By : Thomas Pettit, Scott Cosentino
5 (1)
Book Image

The MySQL Workshop

5 (1)
By: Thomas Pettit, Scott Cosentino

Overview of this book

Do you want to learn how to create and maintain databases effectively? Are you looking for simple answers to basic MySQL questions as well as straightforward examples that you can use at work? If so, this workshop is the right choice for you. Designed to build your confidence through hands-on practice, this book uses a simple approach that focuses on the practical, so you can get straight down to business without having to wade through pages and pages of dull, dry theory. As you work through bite-sized exercises and activities, you'll learn how to use different MySQL tools to create a database and manage the data within it. You'll see how to transfer data between a MySQL database and other sources, and use real-world datasets to gain valuable experience of manipulating and gaining insights from data. As you progress, you'll discover how to protect your database by managing user permissions and performing logical backups and restores. If you've already tried to teach yourself SQL, but haven't been able to make the leap from understanding simple queries to working on live projects with a real database management system, The MySQL Workshop will get you on the right track. By the end of this MySQL book, you'll have the knowledge, skills, and confidence to advance your career and tackle your own ambitious projects with MySQL.
Table of Contents (22 chapters)
1
Section 1: Creating Your Database
6
Section 2: Managing Your Database
11
Section 3: Querying Your Database
16
Section 4: Protecting Your Database

Chapter 4: Selecting, Aggregating, and Applying Functions

In this chapter, we cover different ways to get the information we need out of MySQL data. We will learn how to filter out the records and apply functions on the data – for example, to only return the first 15 characters of a field. We will then start to use GROUP BY to group rows and calculate results built on the groups. This is often used to sum all the values in a group or count how many items they are in one.

This chapter covers the following topics:

  • An introduction to querying data
  • Querying tables in MySQL
  • Exercise 4.01 – simple queries
  • Filtering results
  • Exercise 4.02 – filtering results
  • Using functions on data
  • Exercise 4.03 – using functions
  • Aggregating data
  • Exercise 4.04 – aggregating data
  • Case statements
  • Exercise 4.05 – writing case statements
  • Activity 4.01 – collecting information for a travel article