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  • Book Overview & Buying The MySQL Workshop
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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 JSON functions and operators to query JSON columns

For this, we use the MySQL client. You can also use MySQL Shell in SQL mode; just issue \sql after connecting with MySQL Shell.

There are many convenient functions to deal with JSON data when you are working with collections in SQL mode or tables that use JSON fields.

The first thing to do is extract and unquote fields. This is something we did in the previous chapter, so here is a quick reminder of it. The functions are JSON_EXTRACT() and JSON_UNQUOTE(). However, it is more convenient to use the operators that were created to do this – -> to extract and ->> to extract and unquote. You have to specify a JSON path expression to the extract function, which in its most basic form looks like $.name, to extract the name field.

Consider the following example:

SELECT doc->>'$.name' FROM worldcol LIMIT 5;

This produces the following output:

Figure 13.38 – The...

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The MySQL Workshop
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