I'm using PHP and MySQL. Is this the best method to select information about "user_1" from four different tables? I know it works, because I have tried it. But is this the preferred method of selecting information from multiple tables for "user_1"?

$query = "SELECT table_1.username, table_2.city, table_3.state, table_4.country
    FROM table_1
    JOIN table_2
        ON table_1.username=table_2.city
    JOIN table_3
        ON table_1.username=table_3.state
    JOIN table_4
        ON table_1.username=table_4.country
    WHERE table_1.username = 'user_1'";