Entity types in the ER diagram.

Consider the attached ER diagram (please see attachment for ER diagram) as part of a BANK database. Each bank can have multiple branches, and each branch can have multiple accounts and loans.

Answer the following questions based on the ER diagram.

(a) List the strong (nonweak) entity types in the ER diagram.

(b) Is there a weak entity type? If so, give its name, its partial key, and its 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.

Sample Solution

ACED ESSAYS