After creating the tables, Angela needs to:Add a new foreign key constraint WorkoutID_FK on the Exercises table for WorkoutID to ensure proper referencing.

To add a new foreign key constraint WorkoutID_FK on the Exercises table for WorkoutID to ensure proper referencing, Angela can follow these steps:

1. First, she needs to make sure that the WorkoutID exists in the table that she wants to reference. In this case, it should exist in another table, let's say Workouts table.

2. Then, she can use the ALTER TABLE statement to add a foreign key to the Exercises table. The SQL command would look something like this:

ALTER TABLE Exercises
ADD CONSTRAINT WorkoutID_FK
FOREIGN KEY (WorkoutID) REFERENCES Workouts(WorkoutID);

3. In this command, WorkoutID_FK is the name of the new foreign key, WorkoutID is the column in the Exercises table that the foreign key is being added to, and Workouts(WorkoutID) specifies the table and column that the foreign key references.

4. After running this command, the WorkoutID_FK foreign key constraint is added to the Exercises table, ensuring that every value in the WorkoutID column of the Exercises table matches a value in the WorkoutID column of the Workouts table.

5. If she tries to insert or update a record in the Exercises table with a WorkoutID that does not exist in the Workouts table, the database will return an error and not allow the change.