I would use a join table, teacher_flights.
create table teacher_flights(
teacher_id int(11) not null,
flight_id int(11) not null,
primary key(teacher_id, flight_id));
> From: Mark Phillips <mark@stripped>
>To: Mysql List <mysql@stripped>
>Sent: Friday, March 23, 2012 7:28 PM
>Subject: OT: SQL Question
>My question is not specific to MySQL, even though I am using a MySQL db for
>this project. I have a servlet/jsp/MySQL web site in production, and there
>are about 2,000 records in the flights table. One of the foreign keys is
>teacher_id. Up to this point, there is a one to many relationship between
>teacher_id and the data in the flights table. I need to change the data
>model to allow for a many to many relationship between teacher_id and the
>data in the flight table. What is the best way to do this?