The image shows the dependency graph for tables used in a car-racing example in which the driver_w_mgr table has a foreign-key column, manager_id, which is linked to the driver_w_mgr table's primary-key column driver_id.

There are two boxes, with labels team and driver_w_mgr — the two table names.

At the bottom is the driver_w_mgr box. An arrow goes from this box to itself. The arrow has two labels: (1) driver_id (PK), at the arrowhead end, and (2) manager_id (FK), at the arrow-origin end.

At the top of the diagram, above the driver_w_mgr box, is the team box. There's an arrow from the driver_w_mgr 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-left 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.