两列上的外键引用Oracle另一表中的一个pk

Question

Is there a way to create a foreign key on two columns that reference the same PK in another table?

Both of these columns are related to the PK.

Here is what I have:

CONSTRAINT some_FK FOREIGN KEY (col1, col2) REFERENCES table(col_PK); 

But I keep getting the following error:

ORA-02256: number of referencing columns must match referenced columns

Answer 1

You want two different foreign keys:

CONSTRAINT old_player_fk FOREIGN KEY (old_player_id) REFERENCES player(id), 
CONSTRAINT new_player_fk FOREIGN KEY (new_player_id) REFERENCES player(id)