One to Many Select Statement

Looking for clarification... Say that I have a user table and group table -> -- user table -- id username 1 foo -- group table -- id user_id group_name

1   1        group_1
2   1        group_2

Would this be the proper way to construct a select statement for this -> select u.username, g.group_name from user u, group g where u.user.id = g.user_id and user.id = 1; The results should look like this -> username group_name

foo       group 1
foo       group 2

What I would like to clarify, is if this is the proper (only) way to construct a one to many select statement? I've always thought I was doing something illegal, since username is displayed more than once, and I would like to shake that thought off my back. Thanks for your input..