Working with databases

An RDBMS allows you to store data in a structured way, with relations between the different data collections. These collections of data are stored in tables. However, each table is located in a database. We can see this structure as a container for tables and other objects. In MariaDB, schema is a synonym for database and is used in the documentation as well as in the statement syntax.

To list the existing databases, we can use the SHOW DATABASES statement. Let's try it on our newly installed MariaDB:

MariaDB [(none)]> SHOW DATABASES;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| test               |
+--------------------+
3 rows in set (0.09 sec)

As we can see in this code snippet, there are several built-in databases. They are as follows:

• information_schema: A virtual database containing various meta-information about our data structures and server usage. It can be read, but not directly...