Figure 1 depicts the SQL commands input window for a referential
integrity constraint example. Two tables of data are displayed with
one relationship. For both depicted combo-boxes in the Table Setup
SQL window, the user has a list of three choices: RESTRICT,
CASCADE or SET NULL. When the user clicks the update or
delete button, they will see different results in the tables depending
on the option that was selected (the reset button simply starts an
empty animation). The resulting action is then displayed.