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Sofia Relational Databases Unit 3.1 Questions and Answers 100% correct
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Sofia Relational Databases Unit 3.1
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Sofia Relational Databases Unit 3.1Which of the following statements represents a correctly structured transaction? - answerBEGIN;
UPDATE customer
SET company='Telus', support_rep_id=6
WHERE customer_id = 9;
UPDATE customer
SET phone='9991112222', email='daanpeeters@gmail.com'
WHERE first_name = 'Daan' AND last_name='Peeters';
UPDATE employee
SET reports_to = 1, title = 'IT Manager'
WHERE last_name = 'King' AND first_name = 'Robert';
COMMIT;
Which of the following criteria is specific to the consistency property? - answerWhen a transaction is completed, the database must be in a consistent state.
Which of the following scenarios reflect the atomicity property? - answer1. A user attempts to add an order to the database.
2. They successfully add the customer, then add the order table.
3. However, when trying to add the products to the order, the products no longer had any stock.
4. The entire order has to be canceled.
Which of the following scenarios reflects the consistency property at work? - answer1. The newsletter column can only accept Y or N as options.
2. The user attempts to enter in Maybe.
3. The transaction is rolled back.
Which of the following scenarios reflect the isolation property? - answer1. The product quantity starts at 200.
2. Transaction 1 runs to read the quantity of the product to be updated.
3. Transaction 2 attempts to read the quantity of the same product.
4. Transaction 2 has to wait until transaction 1 is complete.
5. Transaction 1 updates the product quantity to reduce it by 100.
6. Transaction 2 is now able to read the quantity to be updated.
7. Transaction 2 updates the product quantity to reduce it by 5.
8. The product quantity ends at 95.
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