You can add a column to an existing MariaDB table by using the `ALTER TABLE` command. Here is a generic example:
```
ALTER TABLE table_name
ADD COLUMN new_column_name column_type;
```
- `table_name` is the name of the table where you want to add the new column.
- `new_column_name` is the name for the new column you are adding.
- `column_type` is the type of the new column (like INT, VARCHAR, DATE, etc).
For instance, suppose you have a table named customers and you want to add a new column to store email addresses. The command would be:
```
ALTER TABLE customers
ADD COLUMN email VARCHAR;
```
In this example, the `VARCHAR` means that the new `email` column will be a string that can store up to 255 characters.
