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The MySQL Workshop

The MySQL Workshop

By : Thomas Pettit , Scott Cosentino
4.6 (11)
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The MySQL Workshop

The MySQL Workshop

4.6 (11)
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

Using generated columns to query and index JSON data

If you find yourself constantly extracting the same key from a JSON document in SQL mode, then it might be time to create a so-called generated column. The generated column looks like a normal column, but it has the data from whatever function you provide, usually an extract and unquote on a JSON document. The data for the generated column can either be virtual (generated on the go) or stored. The benefit of a fully virtual column is that adding or removing it is instantaneous, and it doesn't take up any storage space. With a generated column, the benefit is that it can be faster because it doesn't have to be generated every time it is used.

Take the worldcol collection as an example:

ALTER TABLE worldcol
ADD COLUMN district VARCHAR(255) AS (doc->>'$.district') NOT NULL;

This extracts the district from the JSON document and places it in a generated column:

Figure 13.45 –...

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The MySQL Workshop
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