+---------+ 0,* 0,1 +-----------+
| Address |<-toAddresses----toEmployee->| Employee |
|---------| (cascade) (deny) |-----------|
| street | | lastName |
| zipCode | +-------------| firstName |
| town | | +-----------+
+---------+ | ^
| / \
+-----------+ 0,* | T
| Holidays |<-holidays---+ |
|-----------| (cascade) +--------------+
| startDate | | |
| endDate | +-----------+ +------------+
+-----------+ | Executive | | SalesClerk |
|-----------| |------------|
+-------+ 0,1 0,* | lastName | | lastName |
| Mark |<-marks------executive->| firstName | | firstName |
|-------| (cascade) (nullify) | age | | age |
| month | | birthday | | birthday |
| mark | +-----------+ +------------+
+-------+
