Use the following diagram to answer the questions below. Is Instructor_Skill a w

Question

Use the following diagram to answer the questions below. Is Instructor_Skill a weak or strong entity? What type of relationship does lnstructor_Skill resolve? Is the relationship between Instructor and Instructor_Skill identifying or non-identifying? Is the relationship between Course and Course_Instructor identifying or non-identifying? What kind of primary key does lnstructor_Skill have? What type of entity is lnstructor_Skill? Is Course a weak or strong entity? Is the relationship between Skill and lnstructor_Skill identifying or non-identifying? Is Building_Room a weak or strong entity? Is the relationship between Vendor and Computer identifying or non-identifying?

Explanation / Answer

21. Weak entity.

Because a weak entity is one which cannot have its own primary key. It takes other entities attribute using foreign key and make this as primary key.

22. Ternary Relationship

As this instructor_skill has relationship with 2 entities i.e. this has been produced from the 2 other entities with relationship which is called as ternary Relationship.

23. Identifying.

24. Identifying.

25. Composite Primary Key

26. Weak entity

27. Strong entity.

28. Identifying.

29. Strong entity.

30. Identifying.

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