Explain and differentiate between i. strong entities and weak entities ii. Strong relationship and weak relationship
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Explain and differentiate between
i. strong entities and weak entities
ii. Strong relationship and weak relationship
Step by step
Solved in 3 steps
- What distinguishesa weak entity from a strong entity that has a required relationshipto another entity?Are associative entities also weak entities? Why or why not? If yes, is there anything special about their “weakness”?What does an associative entity model? a.) Associative entities model pure relationships rather than entities. b.) Associative entities model entities that are independent. c.) Associative entities model the real-world scenarios of ways to look up data. d.) Associative entities model attributes and how they are linked to entities.
- The distinction between a weak and a strong entity set is best explained here.TRUE or FALSE - Generalization (is-a) is the relationship established between entities to show that sub-entities that are derived from the generalized entity. Select one: a. TRUE b.FALSEa. Structurally-speaking, what weakens a weak entity (ie. why do we even call it 'weak')? b.How would we "strengthen" a weak entity (make it be not weak)? What specifically makes this not be weak?
- What is the difference between a weak and a strong group of entities?An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A. What is the cardinality ratio? a. one to many b. many to one c. one to one d. many to manyList the Entity-Relationship (ER) model's various characteristics.