Consider the ER diagram shown in Figure 3.22 for part of a BANK database. Each bank can have multiple branches, and each branch can have multiple accounts and loans. a. List the st... Consider the ER diagram shown in Figure 3.22 for part of a BANK database. Each bank can have multiple branches, and each branch can have multiple accounts and loans. a. List the strong (nonweak) entity types in the ER diagram. b. Is there a weak entity type? If so, give its name, partial key, and identifying relationship. c. What constraints do the partial key and the identifying relationship of the weak entity type specify in this diagram? d. List the names of all relationship types, and specify the (min, max) constraint on each participation of an entity type in a relationship type. Justify your choices.
Understand the Problem
The question is asking for an analysis of an ER diagram related to a BANK database, specifically to identify strong and weak entity types, discuss constraints, and list relationship types with their participation constraints.
Answer
a. BANK, BRANCH, ACCOUNT, LOAN, CUSTOMER. b. None. c. None. d. Constraints: (1,N), (1,N), (1,N), (M,N), (M,N).
a. Strong entities: BANK, BRANCH, ACCOUNT, LOAN, CUSTOMER. b. Weak entity: None. c. None d. Relationships: (BANK, BRANCH) (1,N), (BRANCH, ACCOUNT) (1,N), (BRANCH, LOAN) (1,N), (ACCOUNT, CUSTOMER) (M,N), (LOAN, CUSTOMER) (M,N).
Answer for screen readers
a. Strong entities: BANK, BRANCH, ACCOUNT, LOAN, CUSTOMER. b. Weak entity: None. c. None d. Relationships: (BANK, BRANCH) (1,N), (BRANCH, ACCOUNT) (1,N), (BRANCH, LOAN) (1,N), (ACCOUNT, CUSTOMER) (M,N), (LOAN, CUSTOMER) (M,N).
More Information
The diagram shows a typical bank system ER model. Strong entity types have independent keys, while weak entities rely on others. Here, all entities can function independently, negating any weak entity.
Tips
A common mistake is misidentifying weak entities. Always check if an entity can stand alone with its own attributes.
Sources
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