1. Example: Banking Database
國立東華大學試題: 資料庫管理
資訊管理學系
1. branch
2. customer
3. depositor
存款戶
Example: Banking Database
分公司
客戶(存款戶,貸款戶)
4. borrower
貸款戶
5. account
存款帳
6. loan
貸款帳

2. Question 1: Write SQL and Output the Results (20%)
Using the Example -- Banking Database, answering the queries:
Find the loan number for each loan of an amount greater than $1200
Find the names of all branches in the loan relations, and remove duplicates
How many tuples of the following statement?
select 
from borrower, loan
How many tuples of the following statement? And what is the output?
select distinct customer-name from borrower, loan where borrower loan-number = loan.loan-number and branch-name = ‘Perryridge’

3. Question 2: Updates (10%)
Query: Increase all accounts with balances over $700 by 6%, all other accounts receive 5%.
Consider two update statements:
update account set balance = balance  where balance > 700
update account set balance = balance  where balance  700
(a) Give the account table after execute the above two update statements.
(b) The order is important, why?
(c) Please write a SQL by using the case statement for above update statements.

4. Question 3: Definition of Relation (15%)
Formally, given sets D1, D2, …. Dn
D1 x D2 x … x Dn = {(a1, a2, …, an) | where each ai  Di}
a Relation r is a subset of D1 x D2 x … x Dn
Thus a relation is a set of n-tuples (a1, a2, …, an) where each ai  Di
D1 = { }
D2 = { }
D3 = { }
D1 x D2 x D3 =
account =
a) Write
b) Write
c) Why the Relation r is a subset of D1 x D2 x … x Dn , please explain it by using above example.
account

5. Question 4: Composition of Operations (10%)
We can build expressions by using multiple operations
Example:
expression: A=C(r x s)
op1: r x s
op2: A=C(r x s) A B   1 2 C D
   10 20 E a b A B   1 2 r
a) ？ s C D E    10 20 a b A B C D E   1 2 10 20 a b
b) ？

6. Assume we have two queries: Q1 and Q2 as follows:
Question 5: View (15%)
Assume we have two queries: Q1 and Q2 as follows:
Q create view big-customer as (select account-number, branch-name from account where balance > 500
Q select *
from big-customer
a) Draw the result of Q2
b) If we want to add a new tuple to big-customer insert into big-customer values (‘A-999’, ‘Hualien’) Where the insertion values will be placed? Draw a table to show your answer.
c) What are the advantages of the View?

7. Question 6: Comparison (10%)
Query: “Find the names of all customers who have a loan at the Perryridge branch.
Query 1 customer-name (branch-name = “Perryridge” ( borrower.loan-number = loan.loan-number (borrower x loan)))
a) ？
Query 2
customer-name (loan.loan-number = borrower.loan-number ( (branch-name = “Perryridge” (loan)) x borrower))
b) ？
c) Which one is better? Why?

8. Question 7: Overall System Structure (20%)
Draw the Overall System Structure and explain the following terms
Query Processor
Storage Manager
Database administrator
Application programmers
Authorization and Integrity Manager
Data dictionary
Query evaluation engine
DDL Interpreter
DML Compiler