Question

Is there a way for me to create only one foreign key in one table that refers to 2 different fields in that same table

example:
table: family

ID | bird | bird_mom | bird_dad

1___X_____2_______3

2____A____4________5

3____B

4____M

5____N

ID is primary and autoincrement and also foreign key for “bird_mom” and “bird_dad” field.
So when I change entries X,A,B,M,N I dont need to change it everywhere, but it will always be recognized by foreign key-ID

Answer 1

Typically, “foreign key” is the name for the child field that points to the parent, so you would have two foreign keys:

CREATE TABLE family (
    ID INTEGER PRIMARY KEY,
    bird TEXT,
    bird_mom INTEGER REFERENCES family(ID),
    bird_dad INTEGER REFERENCES family(ID)
)