Reference no: EM13882961

Using MySQL commands answer the questions listed below usingthe TinyVideoschema. Submit via the D2L dropbox the final SQL scripts for each problem. You must answer all parts of the question before receiving any partial credit. For example, do not expect any points if all you answer is part b of question 3. Each part builds upon the correct answer of the previous part.

1. a) Create a view called customer_with_balances that has the following columns: customer_number, customer_lname and customer_balance. The view should only include those customers where the customer balance is greater than zero.

b) Write the SELECT statement to show all records from the customer_with_balances view.

customer_name	customer_lname	customer_balance
102	Dawson	11
103	knight	6
105	Mcclain	15
107	Elliott	5
109	Ochoa	10
111	Mann	8
112	Trujillo	3

2. a) Create a stored function called get_customer_balance which will return a customer's balance from the membership table by passing in a membership number.

b) Write a single SELECT statement to show the customer balance for member 102 by using the get_customer_balance function.

customer_number	get_customer_balance
102	11

3. a) Create a trigger called membership_balance_updates that will capture any updates made to the mem_balance column in membership. The trigger should only capture those transactions in which the member's balance actually changes. The mem_num, old mem_balance, new mem_balance, user, transaction date should be placed into a membership_balance_audit table.

Use the following script to create the membership_balance_audit table.

CREATE TABLE IF NOT EXISTSmembership_balance_audit

(mem_num             INTEGER,
old_mem_balance    DECIMAL(10,2),
new_mem_balance  DECIMAL(10,2),
transaction_date      TIMESTAMP,
transaction_user      VARCHAR(50));

b) Run the following update statements after the trigger has been created.

UPDATE membershipSET mem_balance = 10.00WHERE mem_num = 104;
UPDATE membership SET mem_fname = 'Dan' WHERE mem_num = 103;

c) Write the SELECT statement to show all records in the membership_balance_audit table. (Note: The transaction date will be different for your result set.)

mem_num	old_mem_balance	new_mem_balance	transaction_date	transaction_user
104	0	10	4/12/2012 0:00	root@localhost

Attachment:- Scripts.rar