how to save marital relationship in a database

Question

I have to save this information in a database

Person -> is married to -> Person

Where should I save that information? What is the proper design pattern shoul

Answer 1

If you can only be maried to one person: 1:1

-------------
- Person    -
-------------
id (key)
maried_to_id (foreign key)

If you can be maried to more than one person or want to keep track of previous mariages, n:n

-------------
- Person    -
-------------
person_id (key)

-------------
- Mariage   -
-------------
first_person_id (foreign key)
second_person_id (foreign key)
start_date
end_date

(also first_person_id + second_person_id + date form a unique key for mariage. You could leave out the date, but then remariages wouldnt be tracked)