Book Image

MariaDb Essentials

Book Image

MariaDb Essentials

Overview of this book

This book will take you through all the nitty-gritty parts of MariaDB, right from the creation of your database all the way to using MariaDB’s advanced features. At the very beginning, we show you the basics, that is, how to install MariaDB. Then, we walk you through the databases and tables of MariaDB, and introduce SQL in MariaDB. You will learn about all the features that have been added in MariaDB but are absent in MySQL. Moving on, you’ll learn to import and export data, views, virtual columns, and dynamic columns in MariaDB. Then, you’ll get to grips with full-text searches and queries in MariaDb. You’ll also be familiarized with the CONNECT storage engine. At the end of the book, you’ll be introduced to the community of MariaDB.
Table of Contents (15 chapters)
MariaDB Essentials
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Working with times and dates


As we discussed in Chapter 2, Databases and Tables, MariaDB supports the following temporal data types:

  • DATE

  • TIME

  • DATETIME

  • TIMESTAMP

Working with this kind of data requires specifically-designed functions and syntaxes. This section discusses how to perform the most common temporal operations.

Writing temporal values

With old MariaDB versions, DATE, TIME, and DATETIME values can only be written as strings. This syntax has been designed to be as error-proof as possible, which makes it very easy to use. Some examples are as follows:

  • '1994-01-01'

  • '1994-01-01 12:30:00'

  • '12:30'

Starting from version 10.0, the standard SQL syntax can be used. This eliminates ambiguities in the rare cases when MariaDB does not know if a value should be regarded as a string or as a date. The standard syntax is:

  • DATE '1994-01-01'

  • TIMESTAMP '1994-01-01 12:30:00'

  • TIME '12:30'

Adding and subtracting time intervals

It is possible to add or subtract a time interval to specific temporal data. The syntax...