THIS DEFINES AN ADDITIONAL TABLE LEVEL CONSTRAINT EMP_HIREDATE_CK....

14. This defines an additional table level constraint EMP_HIREDATE_CK. The

constraint checks for use of child labor, by rejecting any rows where the date

of hiring is not at least 16 years later than the birthday. This constraint could

not be defined in line with HIREDATE, because the syntax does not allow

references to other columns at that point.