Add query optimization scripts and results

sql/query_optimization_results.txt

@@ -0,0 +1,47 @@
+# Task 1
+> delimiter $
+> source ./get_max_quantity.sql
+> delimiter ;
+> call GetMaxQuantity();
++--------------------+
+| MaxQuantityInOrder |
++--------------------+
+| 15                 |
++--------------------+
+
+# Task 2
+> source ./get_order_detail.sql
+> set @customerID = 1
+> execute GetOrderDetail using @customerID
++---------+----------+-------+
+| OrderID | Quantity | Cost  |
++---------+----------+-------+
+| 4       | 3        | 29.00 |
++---------+----------+-------+
+
+# Task 3
+> delimiter $
+> source ./cancel_order.sql
+> delimiter ;
+> call CancelOrder(2)
++----------------------+
+| Confirmation         |
++----------------------+
+| Order 2 is cancelled |
++----------------------+
+> select * from `Orders`
++---------+---------------------+---------------------+------------+-----------+
+| OrderID | Started             | Finished            | BillAmount | BookingID |
++---------+---------------------+---------------------+------------+-----------+
+| 1       | 2024-11-14 18:05:00 | 2023-10-01 19:25:00 | 82.50      | 1         |
+| 3       | 2024-11-14 19:10:00 | 2023-10-03 20:30:00 | 31.00      | 3         |
+| 4       | 2024-11-14 19:35:00 | 2023-10-04 20:50:00 | 29.00      | 4         |
+| 5       | 2024-11-14 19:40:00 | 2023-10-05 20:55:00 | 20.00      | 5         |
+| 6       | 2024-11-14 19:40:00 | 2023-10-06 20:45:00 | 150.50     | 6         |
++---------+---------------------+---------------------+------------+-----------+
+> call CancelOrder(2)
++-----------------------+
+| Confirmation          |
++-----------------------+
+| Order 2 doesn't exist |
++-----------------------+