question archive 1) Write a script that creates and calls a stored procedure named test
1) Write a script that creates and calls a stored procedure named test
Subject:Computer SciencePrice: Bought3
1) Write a script that creates and calls a stored procedure named test. This procedure should include two SQL statements coded as a transaction to delete the row with a customer ID of 8 from the Customers table. To do this, you must first delete all addresses for that customer from the Addresses table.
If these statements execute successfully, commit the changes. Otherwise, roll back the changes.
2. Write a script that creates and calls a stored procedure named test. This procedure should include these statements coded as a transaction:
INSERT INTO orders VALUES
(DEFAULT, 3, NOW(), '10.00', '0.00', NULL, 4,
'American Express', '378282246310005', '04/2016', 4);
SELECT LAST_INSERT_ID()
INTO order_id;
INSERT INTO order_items VALUES
(DEFAULT, order_id, 6, '415.00', '161.85', 1);
INSERT INTO order_items VALUES
(DEFAULT, order_id, 1, '699.00', '209.70', 1);
Here, the LAST_INSERT_ID function is used to get the order ID value that's automatically generated when the first INSERT statement inserts an order.
If these statements execute successfully, commit the changes. Otherwise, roll back the changes.
3. Write a script that creates and calls a stored procedure named test. This procedure should use a transaction that includes the statements necessary to combine two customers. These statements should do the following:
Select a row from the Customers table for the customer with a customer_id value of
6. This statement should lock the row so other transactions can't read or modify it until the transaction commits, and it should fail immediately if the row is locked from another session.
Update the Orders table so any orders for the selected customer are assigned to the customer with a customer_id value of 3.
Update the Addresses table so any addresses for the selected customer are assigned to the customer with a customer_id value of 3. Delete the selected customer from the Customers table.
If these statements execute successfully, commit the changes. Otherwise, rollback the changes.
