Book Image

Getting Started with MariaDB

By : Daniel Bartholomew
Book Image

Getting Started with MariaDB

By: Daniel Bartholomew

Overview of this book

MariaDB is a database that has become very popular in the few short years that it has been around. It does not require a big server or expensive support contract. It is also powerful enough to be the database of choice for some of the biggest and most popular websites in the world, taking full advantage of the latest computing hardware available. From installing and configuring through basic usage and maintenance, each chapter in this revised and expanded guide leads on sequentially and logically from the one before it, introducing topics in their natural order so you learn what you need, when you need it. The book is based on the latest release of MariaDB and covers all the latest features and functions. By the end of this beginner-friendly book, not only will you have a running installation of MariaDB, but you will have practical, hands-on experience in the basics of how to install, configure, administer, use, and maintain it.
Table of Contents (16 chapters)
Getting Started with MariaDB Second Edition
About the Author
About the Reviewers
MariaDB Next Steps

Summarizing data

Sometimes, we are just looking for information about our data. For this, MariaDB has several built-in functions: AVG, COUNT, MIN, MAX, and SUM.

The AVG function

The AVG function is used for obtaining the average of the data in a column. For example, combined with the TIMESTAMPDIFF and CURDATE functions, we can use the AVG function to calculate the average age of all of the people in the employees table.

The CURDATE function doesn't take any arguments and when called, it simply returns the current date.

The TIMESTAMPDIFF function takes three arguments—the unit to count by and two dates, and then outputs the difference between the two. The unit is one of several time units, including MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, and YEAR.


The TIMESTAMPDIFF and CURDATE functions are just two of several functions that make working with dates and times easier. Find out more about them at the following location:

Putting all three functions...