Added Increasing Sales Revenue

Author: thecoddiwompler

Increasing Sales Revenue/READme.md

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+# Increasing Sales Revenue
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+
+---
+
+## 🛠️ Problem Statement
+
+<b> This problem has been asked in Deloitte Interview. </b>
+
+  <b>Table Name : Products</b>
+
+|  Column Name  |Type |
+| ------------- | ------------- |
+| product_id  | int  |
+| product_name  | varchar(50)  |
+| category | varchar(50) |
+
+* <b> product_id is Primary Key of this table. </b> <br>
+<br>
+  
+<b>Table Name : Sales</b>
+
+|  Column Name  |Type |
+| ------------- | ------------- |
+| product_id  | int  |
+| year  | int  |
+| total_sales_revenue | DECIMAL(10, 2) |
+
+* <b> product_id, year is the Primary Key of this table. </b>
+* product_id is the Foreign key to Products table.
+<br><br>
+
+Write a sql query to find the products whose total sales revenue has increased every year. Include the product_id , product_name and category in the result.
+Sort the result by product_id.
+
+</br>
+ <details>
+<summary>
+Input
+</summary>
+</br>
+
+<b> Table Name: Products </b></br>
+
+| product_id | product_name | category          |
+|------------|--------------|-------------------|
+| 1          | Laptops      | Electronics      |
+| 2          | Jeans        | Clothing         |
+| 3          | Chairs       | Home Appliances  |
+
+<b> Table Name: Sales </b></br>
+
+| product_id | year | total_sales_revenue |
+|------------|------|---------------------|
+| 1          | 2019 | 1000.00             |
+| 1          | 2020 | 1200.00             |
+| 1          | 2021 | 1100.00             |
+| 2          | 2019 | 500.00              |
+| 2          | 2020 | 600.00              |
+| 2          | 2021 | 900.00              |
+| 3          | 2019 | 300.00              |
+| 3          | 2020 | 450.00              |
+| 3          | 2021 | 400.00              |
+
+
+</details>
+
+<details>
+<summary>
+Output
+</summary>
+</br>
+
+| product_id | product_name | category          |
+|------------|--------------|-------------------|
+| 2          | Jeans        | Clothing         |
+  
+</details>
+
+---

Increasing Sales Revenue/schema.sql

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+CREATE TABLE products (
+    product_id INT PRIMARY KEY,
+    product_name VARCHAR(50),
+    category VARCHAR(50)
+);
+
+CREATE TABLE sales (
+    product_id INT,
+    year INT,
+    total_sales_revenue DECIMAL(10, 2),
+    PRIMARY KEY (product_id, year),
+    FOREIGN KEY (product_id) REFERENCES products(product_id)
+);
+
+INSERT INTO
+    products (product_id, product_name, category)
+VALUES
+    (1, 'Laptops', 'Electronics'),
+    (2, 'Jeans', 'Clothing'),
+    (3, 'Chairs', 'Home Appliances');
+
+COMMIT;
+
+INSERT INTO
+    sales (product_id, year, total_sales_revenue)
+VALUES
+    (1, 2019, 1000.00),
+    (1, 2020, 1200.00),
+    (1, 2021, 1100.00),
+    (2, 2019, 500.00),
+    (2, 2020, 600.00),
+    (2, 2021, 900.00),
+    (3, 2019, 300.00),
+    (3, 2020, 450.00),
+    (3, 2021, 400.00);
+
+COMMIT;

Increasing Sales Revenue/solution.sql

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+WITH cte AS (
+    SELECT
+        product_id,
+        RANK() OVER(
+            PARTITION BY product_id
+            ORDER BY
+                year
+        ) year_rank,
+        RANK() OVER(
+            PARTITION BY product_id
+            ORDER BY
+                total_sales_revenue
+        ) sales_rank
+    FROM
+        sales
+),
+sol AS (
+    SELECT
+        product_id,
+        COUNT(product_id) total_count,
+        COUNT(product_id) filter(
+            WHERE
+                year_rank = sales_rank
+        ) revenue_increase_count
+    FROM
+        cte
+    GROUP BY
+        product_id
+)
+SELECT
+    a.product_id,
+    b.product_name,
+    b.category
+FROM
+    sol a
+    INNER JOIN products b ON a.product_id = b.product_id
+WHERE
+    a.total_count = a.revenue_increase_count
+ORDER BY
+    a.product_id

iqsql.md

@@ -2,8 +2,9 @@
 2. Employees Check-in Details
 3. Employees Hiring [Difficult]
 4. Highest-Grossing Items
-5. Last Person to Fit in the Bus
-6. Manager with at least 5 direct reportees
-7. Mismatched IDs
-8. Odd and Even Measurements
-9. Qualifying Criteria
+5. Increasing Sales Revenue
+6. Last Person to Fit in the Bus
+7. Manager with at least 5 direct reportees
+8. Mismatched IDs
+9. Odd and Even Measurements
+10. Qualifying Criteria