Consider the ER diagram shown in Figure 3.22 for part of a BANK database. Eachbank can have multiple branches, and each branch can have multiple accounts andloans.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 identifyingrelationship.c. What constraints do the partial key and the identifying relationship of theweak entity type specify in this diagram?d. List the names of all relationship types, and specify the (min, max) constrainton each participation of an entity type in a relationship type. Justify yourchoices.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 toat most two loans at a time, and that a bank branch cannot have more than1,000 loans. How does this show up on the (min, max) constraints?Figure 3.22An ER diagram for a BANK database schema.CodeBANKName AddrPhoneBRANCHESAcct_noSsnACCTSIN1ACCOUNTMA_CNBalanceNNameCUSTOMERTypeBANK BRANCHAddrAddrLOANSLoan noNLOANNMLCBranch noAmountType

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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?

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?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Question

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.
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
1,000 loans. How does this show up on the (min, max) constraints?
Figure 3.22
An ER diagram for a BANK database schema.
Code
BANK
Name Addr
Phone
BRANCHES
Acct_no
Ssn
ACCTS
IN
1
ACCOUNT
M
A_C
N
Balance
N
Name
CUSTOMER
Type
BANK BRANCH
Addr
Addr
LOANS
Loan no
N
LOAN
N
M
LC
Branch no
Amount
Type

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