Add sales report scripts and results

sql/create_orders_view.sql

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+-- sales report - task 1
+-- changes:
+--   interpreted quantity as the number of ordered items, because I assumed that Little lemon wants
+--   orders à la carte instead of fixed menus
+drop view if exists OrdersView;
+
+create view OrdersView as
+select
+    O.OrderID,
+    count(OI.MenuItemID) as Quantity,
+    O.BillAmount as Cost
+from Orders as O
+inner join OrderItems as OI on O.OrderID = OI.OrderID
+group by O.OrderID
+having Quantity > 2;

sql/get_expensive_orders.sql

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+-- sales report - task 2
+-- changes:
+--   removed menu name, because I assumed that Little lemon wants orders à la carte instead of fixed menus
+--   changed cost cutoff from 150.00 to 75.00, because I wanted more than one test result
+with
+GroupedOrderItems as (
+    select
+        OI.OrderID,
+        MI.Category,
+        concat(MI.Name, " (", count(OI.OrderItemID), "x)") as Item
+    from OrderItems as OI
+    inner join MenuItems as MI on OI.MenuItemID = MI.MenuItemID
+    group by OI.OrderID, MI.Category, OI.MenuItemID
+),
+
+MainOrderItems as (
+    select
+        OrderID,
+        group_concat(Item separator '\n') as Items
+    from GroupedOrderItems
+    where Category = "Main"
+    group by OrderID
+),
+
+StarterOrderItems as (
+    select
+        OrderID,
+        group_concat(Item separator '\n') as Items
+    from GroupedOrderItems
+    where Category = "Starter"
+    group by OrderID
+)
+
+select
+    C.CustomerID,
+    concat(C.FirstName, " ", C.LastName) as FullName,
+    O.OrderID,
+    O.BillAmount as Cost,
+    coalesce(MOI.Items, "") as Mains,
+    coalesce(SOI.Items, "") as Starters
+from Orders as O
+inner join Bookings as B on O.BookingID = B.BookingID
+inner join Customers as C on B.CustomerID = C.CustomerID
+left join MainOrderItems as MOI on O.OrderID = MOI.OrderID
+left join StarterOrderItems as SOI on O.OrderID = SOI.OrderID
+where O.BillAmount > 75.00
+group by O.OrderID;

sql/get_popular_menu_items.sql

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+-- sales report - task 3
+-- changes:
+--   replaced menu name with menu item name, because I assumed that Little lemon wants orders à la carte
+--   instead of fixed menus
+select
+    MI.Name,
+    count(OI.OrderItemID) as OrderQuantity
+from MenuItems as MI
+inner join OrderItems as OI on MI.MenuItemID = OI.MenuItemID
+group by OI.MenuItemID
+having OrderQuantity > 2;

sql/sales_report_results.txt

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+# Task 1
+> source ./create_orders_view.sql
+> select * from OrdersView;
++---------+----------+--------+
+| OrderID | Quantity | Cost   |
++---------+----------+--------+
+| 1       | 9        | 82.50  |
+| 2       | 3        | 28.00  |
+| 3       | 3        | 31.00  |
+| 4       | 3        | 29.00  |
+| 6       | 15       | 150.50 |
++---------+----------+--------+
+
+# Task 2
+> source ./get_expensive_orders.sql
++------------+---------------+---------+--------+-----------------------+--------------------------+
+| CustomerID | FullName      | OrderID | Cost   | Mains                 | Starters                 |
++------------+---------------+---------+--------+-----------------------+--------------------------+
+| 3          | Li Wei Zhang  | 1       | 82.50  | Gigantes Plaki (2x)   | Grilled Artichokes (1x)  |
+|            |               |         |        | Pasta alla Norma (1x) | Lentil Soup (1x)         |
+|            |               |         |        |                       | Humus Plate (1x)         |
+| 5          | Ivanov Petrov | 6       | 150.50 | Minestrone (2x)       | Lentil Soup (2x)         |
+|            |               |         |        | Gigantes Plaki (2x)   | Eggplant Bruschetta (1x) |
+|            |               |         |        | Moussaka (1x)         | Humus Plate (1x)         |
+|            |               |         |        |                       | Grilled Artichokes (1x)  |
++------------+---------------+---------+--------+-----------------------+--------------------------+
+
+# Task 3
+> source ./get_popular_menu_items.sql
++--------------------+---------------+
+| Name               | OrderQuantity |
++--------------------+---------------+
+| Lentil Soup        | 4             |
+| Humus Plate        | 3             |
+| Gigantes Plaki     | 5             |
+| Minestrone         | 3             |
+| Fruit Salad        | 3             |
+| Grilled Mango      | 3             |
+| Grilled Waterlemon | 3             |
++--------------------+---------------+