
Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe
Edition 6ISBN: 0136086209
Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe
Edition 6ISBN: 0136086209 Exercise 13
Exercise 7.30
Composite and multi-valued attributes can be nested to any number of levels.
Suppose we want to design an attribute for a STUDENT entity type to keep track of previous college education. Such an attribute will have one entry for each college previously attended, and this entry is composed of: college name, start and end dates, degree entries (degrees awarded at that college, if any), and transcript entries (courses completed at that college, if any). Each degree entry is formed of degree name and the month and year it was awarded, and each transcript entry is formed of a course name, semester, year, and grade. Design an attribute to hold this information. Use the conventions of Figure 7.5.

-Show an alternative design for the attribute described in Exercise 7.30 that uses only entity types (including weak entity types if needed) and relationship types.
Composite and multi-valued attributes can be nested to any number of levels.
Suppose we want to design an attribute for a STUDENT entity type to keep track of previous college education. Such an attribute will have one entry for each college previously attended, and this entry is composed of: college name, start and end dates, degree entries (degrees awarded at that college, if any), and transcript entries (courses completed at that college, if any). Each degree entry is formed of degree name and the month and year it was awarded, and each transcript entry is formed of a course name, semester, year, and grade. Design an attribute to hold this information. Use the conventions of Figure 7.5.

-Show an alternative design for the attribute described in Exercise 7.30 that uses only entity types (including weak entity types if needed) and relationship types.
Explanation
This example illustrates a perceived wea...
Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe
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