Add sales report scripts and results

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;