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

Exercise 4.04 – aggregating data

In this exercise, you will utilize the world database once again. You need some data about continents and regions for another news article, including the following information for each continent:

  • The surface area for all the countries in that continent combined
  • The average GNP per continent
  • The total surface area per region for Asia

You will first connect to the world database, get the per continent data, and then get the per region data. Perform the following steps to complete this exercise:

  1. Connect to the MySQL shell with Workbench and the appropriate user.
  2. Make sure that you are using the world database:
    USE world;

This outputs the following results:

Figure 4.28 – The USE output

  1. Obtain the data about each continent by writing the following query:
    SELECT Continent, AVG(GNP), SUM(SurfaceArea)
    FROM country GROUP BY Continent;

This outputs the following results...