Update Cahllenge 1 Steve's car showroom.md

Author: SQLicious

Cahllenge 1 Steve's car showroom.md

@@ -138,24 +138,61 @@ JOIN sales2 sa ON c.car_id = sa.car_id
 JOIN salespersons s ON sa.salesman_id = s.salesman_id
 WHERE YEAR(sa.purchase_date) = 2021 AND s.name = 'Emily Wong';
 ```
-car_id, make, type, style, cost_$
-2, Toyota, Corolla, Hatchback, 25000
-4, Chevrolet, Camaro, Coupe, 36000```
-
 
 ### 7. What is the total revenue generated by the sales of hatchback cars?
 
-``` SQL code ```
+``` SQL
+SELECT SUM(c.cost_$) AS Total_Revenue_Generated
+FROM cars c
+JOIN sales2 sa ON c.car_id = sa.car_id
+WHERE c.style = 'Hatchback';
+ ```
 ### 8. What is the total revenue generated by the sales of SUV cars in the year 2022?
 
- ``` SQL code ```
+ ``` SQL
+SELECT SUM(c.cost_$) AS Total_Revenue_Generated
+FROM cars c
+JOIN sales2 sa ON c.car_id = sa.car_id
+WHERE c.style = 'SUV' AND YEAR(sa.purchase_date) = 2022;
+select * from sales2;
+select * from cars;
+ ```
 
 ### 9. What is the name and city of the salesperson who sold the most number of cars in the year 2023?
 
-``` SQL code ```
+``` SQL
+SELECT s.name AS Salesperson,
+       s.city
+FROM salespersons s
+JOIN (
+    -- Subquery calculates the rank of each salesperson based on the number of cars sold in 2023
+    SELECT salesman_id,
+           RANK() OVER (ORDER BY COUNT(*) DESC) AS Rnk
+    FROM sales2
+    WHERE YEAR(purchase_date) = 2023
+    GROUP BY salesman_id
+) t ON s.salesman_id = t.salesman_id
+-- Select the top ranked result (salesperson with most cars sold)
+WHERE Rnk = 1;
+ ```
 
 ### 10. What is the name and age of the salesperson who generated the highest revenue in the year 2022?
 
-``` SQL code ```
+``` SQL
+SELECT name AS Salesperson, age
+FROM (
+    -- Subquery calculates total revenue generated by each salesperson in 2022 and assigns a rank
+    SELECT s.name,
+           s.age, 
+           RANK() OVER (ORDER BY SUM(c.cost_$) DESC) AS rnk2
+    FROM salespersons s
+    JOIN sales2 ON s.salesman_id = sales2.salesman_id
+    JOIN cars c ON sales2.car_id = c.car_id
+    WHERE YEAR(purchase_date) = 2022
+    GROUP BY s.name, s.age
+) t
+-- Select the top ranked result (salesperson with highest revenue)
+WHERE rnk2 = 1;
+```