(Exercise 3.23 from the book of Elmasri and Navathe, Addison-Wesley)

Consider the ER diagram shown in the following figure for part of a BANK database. Each bank can have multiple branches and each branch can have multiple accounts and loans.

a. List the (non-weak) 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 the 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 choice.

e. List concisely the user requirements that led to this ER schema design.

f. Suppose that every customer must have at least one account but is restricted to at most two loans at a time, and that a bank branch cannot have more than 1000 loans. How does this show up on the (min, max) constraints?

N BANK BRANCHES BANK-BRANCH Name ) ( Addr Addr ACCTS LOANS N -mount Balan Amount [Account-GD ACCOUNT LOAN Type M A-C LC Chor OJSTOMERadD Phone)--I CUSTOMER .Z N N