Databases Reference
In-Depth Information
The DBDL representation is shown in Figure A-9.
322
Department (DepartmentCode, DepartmentName)
Student (StudentNum, LastName, FirstName, LocalStreet, LocalCity,
LocalState, LocalZip, PermStreet, PermCity, PermState, PermZip)
Office (OfficeNum, Phone)
Faculty (FacultyNum, LastName, FirstName, Street, City, State, Zip,
OfficeNum, CurrentRank, StartDate, DepartmentCode)
FK OfficeNum
→
Office
FK DepartmentCode
→
Department
Major (MajorNum, Description, DepartmentCode)
FK DepartmentCode
→
Department
Advises (StudentNum, MajorNum, FacultyNum)
FK StudentNum
→
Student
→
FK FacultyNum
Faculty
FK MajorNum
→
Major
FIGURE A-9
DBDL for User View 2
The result of merging these tables into the cumulative design is shown in Figure A-10. The tables Student,
Faculty, Major, and Department are merged with the existing tables with the same primary keys and with the same
names. Nothing new is added to the Department table in the process, but the other tables receive additional
attributes. In addition, the Faculty table also receives two foreign keys, OfficeNum and DepartmentCode. The Major
table receives one foreign key, DepartmentCode. The Advises and Office tables are new and thus are added directly
to the cumulative design.
