(Homework Solution): 3. Translate the following EER diagram into a relational model (a collection of tables).

3. Translate the following EER diagram into a relational model (a collection of tables). Show the schemas. (15 pts) name ssn Employees Ionitors>-< until since tarted o n-一( -(aname s pid did < Project ーSponsors Departments]

3. Translate the following EER diagram into a relational model (a collection of tables). Show the schemas. (15 pts) name ssn Employees Ionitors>-

Expert Answer

answers

1.First convert lower part of EER diagram to relational schema:

First convert all Entity and Relation to tables

projects

pid Started_on pbudget

Sponsors

Since

Departments

did dname budget

Here projects and Departments have 1:1 relationship with departments contribute to weak participation. Also Sponsors table can be identified with pid of table projects Since projects can be present without departments but converse is not true.

Projects

pid Started_on pbudget Since did dname budget

After merging tables we have modified EER diagram as follows:

Now we have ER schema like this

2. Here there are two table each having n:m cardinality ratio(assumption, not given). As many employees can control many projects employees key is ssn and Projects key is pid

Employees            Projects                Monitors

Ss1    others           pid1 others           ss1 pid1 others

Ss1 others              pid1 others           ss1 pid1 others

Ss1others               pid2 others            ss1 pid2 others

These tables cannot be merged.

The Final answer

Projects

pid Started_on pbudget Since did dname budget

Employees

ssn name lot

Monitors

pid ssn until

(For better visibility image of above EER diagram is given.answer is only above 3 tables)

Here pid and ssn are both used to identify records in Monitors table(candidate key).

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