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Learning PHP 7

You're reading from   Learning PHP 7 Build powerful real-life web applications in a simple way using PHP7 and its ecosystem.

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Product type Paperback
Published in Mar 2016
Publisher Packt
ISBN-13 9781785880544
Length 414 pages
Edition 1st Edition
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Author (1):
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Antonio L Zapata (GBP) Antonio L Zapata (GBP)
Author Profile Icon Antonio L Zapata (GBP)
Antonio L Zapata (GBP)
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Toc

Table of Contents (12) Chapters Close

Preface 1. Setting Up the Environment 2. Web Applications with PHP FREE CHAPTER 3. Understanding PHP Basics 4. Creating Clean Code with OOP 5. Using Databases 6. Adapting to MVC 7. Testing Web Applications 8. Using Existing PHP Frameworks 9. Building REST APIs 10. Behavioral Testing Index

Grouping queries


The last feature that we will discuss about querying is the GROUP BY clause. This clause allows you to group rows of the same table with a common field. For example, let's say we want to know how many books each author has in just one query. Try the following:

mysql> SELECT
    -> author,
    -> COUNT(*) AS amount,
    -> GROUP_CONCAT(title SEPARATOR ', ') AS titles
    -> FROM book
    -> GROUP BY author
    -> ORDER BY amount DESC, author;
+-----------------+--------+-------------------+
| author          | amount | titles            |
+-----------------+--------+-------------------+
| George Orwell   |      2 | 1984, Animal Farm |
| Homer           |      2 | Odyssey, Iliad    |
| Bram Stoker     |      1 | Dracula           |
| Haruki Murakami |      1 | 1Q84              |
| J. M. Barrie    |      1 | Peter Pan         |
| Jodi Picoult    |      1 | 19 minutes        |
+-----------------+--------+-------------------+
5 rows in set (0.00 sec)

The...

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