Zend Framework 1. How to query multiple database tables?

Question

MySQL

We were given a small task on the first zend framework, I didn’t have much to do with it, but I need to display data from three tables at once without links, in one request.
As far as I understand, in this framework a model class is created, where the name of the table with which this model works is indicated, but what should be done if you need to work with several tables?
Here is a small example of how I understood the work with the database.

class Test_Tbl extends Zend_Db_Table_Abstract {
  protected $_name = 'test_table';

     public function select() {
        //какой-то код
    }
}

I would be grateful for any hints.