Foreign key to composite key

Question

I have a problem i need to reference a single foreign key to a composite key in another table.

My database structure is as following:

CREATE TABLE av         


        

Answer 1

If you reference a composite primary key, your foreign key also needs to contain all those columns - so you need something like:

FOREIGN KEY (available_trip_code, date) 
            REFERENCES available_trip (trip_code, date)

If you don't already have all those columns present in your table, then you'll need to add them.

Answer 2

alter table booking add constraint FK_Booking_TripAndDate
    foreign key (available_trip_code,date)
    references available_trip(trip_code, date)