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The MySQL Workshop

The MySQL Workshop

By : Thomas Pettit , Scott Cosentino
4.7 (12)
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The MySQL Workshop

The MySQL Workshop

4.7 (12)
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)
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1
Section 1: Creating Your Database
6
Section 2: Managing Your Database
11
Section 3: Querying Your Database
16
Section 4: Protecting Your Database

Working with user-defined functions

MySQL has many built-in functions that you can call to return values or perform tasks on data, including CURRENT_DATE(), AVG(), SUM(), ABS(), and CONCAT(). These functions can be used in SQL statements, views, and stored procedures. MySQL also has another type of function, known as the user-defined function (UDF), that you can create to add new functionality to the database that is not already provided by MySQL. For example, you may want a function that can calculate and return the GST or sales tax or maybe calculate the income tax for your weekly earnings. A UDF is active when it is loaded into the database with CREATE FUNCTION and hasn't been removed with DROP FUNCTION. A function can be used while it is active.

The basic syntax for creating a UDF is as follows:

USE database_name;
DROP FUNCTION IF EXISTS function_name;
CREATE FUNCTION function_name ([parameter(s)])
 RETURNS data type
 DETERMINISTIC
 STATEMENTS

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