The image shows the dependency graph for tables used in a car-racing example in which the team table has a foreign-key column, lead_driver, which is linked to the driver table's primary-key column driver_id. Other than the addition of this link, it is the same as the graph for the car-racing example.

There are four boxes, with labels driver_race_map, race, driver, and team — the four table names.

At the bottom is the driver_race_map box. Two arrows leave from this box, one with arrowhead on the race box, which is above and to the left of the driver_race_map box, and one with arrowhead on the driver box, which is above and to the right of the driver_race_map box.

The left arrow, ending at the race box, has two labels: (1) race_id (PK), at the arrowhead end, and (2) race_id (FK), at the arrow-origin end. The right arrow, ending at the driver box, has two labels: (1) driver_id (PK), at the arrowhead end, and (2) driver_id (FK), at the arrow-origin end.

At the top of the diagram, above the driver box, is the team box. There's an arrow from the team box to the driver box. It has two labels: (1) driver_id (PK), at the arrowhead end, and (2) lead_driver (FK), at the arrow-origin end. There's an arrow from the driver box to the team box. It has two labels: (1) team_id (PK), at the arrowhead end, and (2) team_id (FK), at the arrow-origin end.

At the lower-right corner of the diagram is a box with title Legend:. The box has these two rows of text: PK: Primary Key and FK: Foreign Key.