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‎src/main/java/g3501_3600/s3564_seasonal_sales_analysis/readme.md

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3564\. Seasonal Sales Analysis
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Medium
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Table: `sales`
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+---------------+---------+
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| Column Name | Type |
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+---------------+---------+
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| sale_id | int |
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| product_id | int |
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| sale_date | date |
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| quantity | int |
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| price | decimal |
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+---------------+---------+
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sale_id is the unique identifier for this table.
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Each row contains information about a product sale including the product_id,
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date of sale, quantity sold, and price per unit.
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Table: `products`
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+---------------+---------+
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| Column Name | Type |
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+---------------+---------+
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| product_id | int |
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| product_name | varchar |
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| category | varchar |
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+---------------+---------+
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product_id is the unique identifier for this table.
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Each row contains information about a product including its name and category.
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Write a solution to find the most popular product category for each season. The seasons are defined as:
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* **Winter**: December, January, February
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* **Spring**: March, April, May
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* **Summer**: June, July, August
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* **Fall**: September, October, November
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The **popularity** of a **category** is determined by the **total quantity sold** in that **season**. If there is a **tie**, select the category with the highest **total revenue** (`quantity × price`).
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Return _the result table ordered by season in **ascending** order_.
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The result format is in the following example.
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**Example:**
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**Input:**
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sales table:
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+---------+------------+------------+----------+-------+
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| sale_id | product_id | sale_date | quantity | price |
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+---------+------------+------------+----------+-------+
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| 1 | 1 | 2023-01-15 | 5 | 10.00 |
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| 2 | 2 | 2023-01-20 | 4 | 15.00 |
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| 3 | 3 | 2023-03-10 | 3 | 18.00 |
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| 4 | 4 | 2023-04-05 | 1 | 20.00 |
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| 5 | 1 | 2023-05-20 | 2 | 10.00 |
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| 6 | 2 | 2023-06-12 | 4 | 15.00 |
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| 7 | 5 | 2023-06-15 | 5 | 12.00 |
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| 8 | 3 | 2023-07-24 | 2 | 18.00 |
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| 9 | 4 | 2023-08-01 | 5 | 20.00 |
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| 10 | 5 | 2023-09-03 | 3 | 12.00 |
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| 11 | 1 | 2023-09-25 | 6 | 10.00 |
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| 12 | 2 | 2023-11-10 | 4 | 15.00 |
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| 13 | 3 | 2023-12-05 | 6 | 18.00 |
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| 14 | 4 | 2023-12-22 | 3 | 20.00 |
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| 15 | 5 | 2024-02-14 | 2 | 12.00 |
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+---------+------------+------------+----------+-------+
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products table:
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+------------+-----------------+----------+
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| product_id | product_name | category |
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+------------+-----------------+----------+
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| 1 | Warm Jacket | Apparel |
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| 2 | Designer Jeans | Apparel |
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| 3 | Cutting Board | Kitchen |
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| 4 | Smart Speaker | Tech |
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| 5 | Yoga Mat | Fitness |
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+------------+-----------------+----------+
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**Output:**
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+---------+----------+----------------+---------------+
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| season | category | total_quantity | total_revenue |
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+---------+----------+----------------+---------------+
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| Fall | Apparel | 10 | 120.00 |
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| Spring | Kitchen | 3 | 54.00 |
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| Summer | Tech | 5 | 100.00 |
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| Winter | Apparel | 9 | 110.00 |
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+---------+----------+----------------+---------------+
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**Explanation:**
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* **Fall (Sep, Oct, Nov):**
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* Apparel: 10 items sold (6 Jackets in Sep, 4 Jeans in Nov), revenue $120.00 (6×$10.00 + 4×$15.00)
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* Fitness: 3 Yoga Mats sold in Sep, revenue $36.00
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* Most popular: Apparel with highest total quantity (10)
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* **Spring (Mar, Apr, May):**
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* Kitchen: 3 Cutting Boards sold in Mar, revenue $54.00
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* Tech: 1 Smart Speaker sold in Apr, revenue $20.00
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* Apparel: 2 Warm Jackets sold in May, revenue $20.00
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* Most popular: Kitchen with highest total quantity (3) and highest revenue ($54.00)
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* **Summer (Jun, Jul, Aug):**
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* Apparel: 4 Designer Jeans sold in Jun, revenue $60.00
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* Fitness: 5 Yoga Mats sold in Jun, revenue $60.00
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* Kitchen: 2 Cutting Boards sold in Jul, revenue $36.00
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* Tech: 5 Smart Speakers sold in Aug, revenue $100.00
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* Most popular: Tech and Fitness both have 5 items, but Tech has higher revenue ($100.00 vs $60.00)
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* **Winter (Dec, Jan, Feb):**
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* Apparel: 9 items sold (5 Jackets in Jan, 4 Jeans in Jan), revenue $110.00
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* Kitchen: 6 Cutting Boards sold in Dec, revenue $108.00
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* Tech: 3 Smart Speakers sold in Dec, revenue $60.00
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* Fitness: 2 Yoga Mats sold in Feb, revenue $24.00
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* Most popular: Apparel with highest total quantity (9) and highest revenue ($110.00)
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The result table is ordered by season in ascending order.

‎src/main/java/g3501_3600/s3564_seasonal_sales_analysis/script.sql

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# Write your MySQL query statement below
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# #Medium #Database #2025_05_26_Time_505_ms_(100.00%)_Space_0.0_MB_(100.00%)
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WITH cte AS (
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SELECT CASE
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WHEN MONTH(sale_date) IN (1, 2, 12) THEN 'Winter'
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WHEN MONTH(sale_date) IN (3, 4, 5) THEN 'Spring'
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WHEN MONTH(sale_date) IN (6, 7, 8) THEN 'Summer'
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WHEN MONTH(sale_date) IN (9, 10, 11) THEN 'Fall'
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END AS season,
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category, SUM(quantity) AS total_quantity, SUM(quantity * price) AS total_revenue
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FROM sales s
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JOIN products p ON s.product_id = p.product_id
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GROUP BY season, category
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),
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cte2 AS (
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SELECT season, category, total_quantity, total_revenue,
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RANK() OVER (PARTITION BY season ORDER BY total_quantity DESC, total_revenue DESC) AS ranking
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FROM cte
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)
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SELECT
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season, category, total_quantity, total_revenue
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FROM cte2
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WHERE ranking = 1
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ORDER BY season ASC;

‎src/test/java/g3501_3600/s3564_seasonal_sales_analysis/MysqlTest.java

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package g3501_3600.s3564_seasonal_sales_analysis;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.hamcrest.MatcherAssert.assertThat;
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import java.io.BufferedReader;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.sql.Connection;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Statement;
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import java.util.stream.Collectors;
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import javax.sql.DataSource;
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import org.junit.jupiter.api.Test;
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import org.zapodot.junit.db.annotations.EmbeddedDatabase;
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import org.zapodot.junit.db.annotations.EmbeddedDatabaseTest;
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import org.zapodot.junit.db.common.CompatibilityMode;
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@EmbeddedDatabaseTest(
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compatibilityMode = CompatibilityMode.MySQL,
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initialSqls =
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"CREATE TABLE sales(sale_id INTEGER, product_id INTEGER"
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+ ", sale_date DATE, quantity INTEGER, price DECIMAL); "
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+ "INSERT INTO sales (sale_id, product_id, sale_date, quantity, price) VALUES"
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+ "(1, 1, '2023-01-15', 5, 10.00),"
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+ "(2, 2, '2023-01-20', 4, 15.00),"
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+ "(3, 3, '2023-03-10', 3, 18.00),"
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+ "(4, 4, '2023-04-05', 1, 20.00),"
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+ "(5, 1, '2023-05-20', 2, 10.00),"
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+ "(6, 2, '2023-06-12', 4, 15.00),"
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+ "(7, 5, '2023-06-15', 5, 12.00),"
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+ "(8, 3, '2023-07-24', 2, 18.00),"
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+ "(9, 4, '2023-08-01', 5, 20.00),"
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+ "(10, 5, '2023-09-03', 3, 12.00),"
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+ "(11, 1, '2023-09-25', 6, 10.00),"
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+ "(12, 2, '2023-11-10', 4, 15.00),"
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+ "(13, 3, '2023-12-05', 6, 18.00),"
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+ "(14, 4, '2023-12-22', 3, 20.00),"
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+ "(15, 5, '2024-02-14', 2, 12.00);"
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+ "CREATE TABLE products(product_id INTEGER, product_name VARCHAR(255)"
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+ ", category VARCHAR(255)); "
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+ "INSERT INTO products (product_id, product_name, category) VALUES"
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+ "(1, 'Warm Jacket', 'Apparel'),"
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+ "(2, 'Designer Jeans', 'Apparel'),"
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+ "(3, 'Cutting Board', 'Kitchen'),"
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+ "(4, 'Smart Speaker', 'Tech'),"
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+ "(5, 'Yoga Mat', 'Fitness');")
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class MysqlTest {
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@Test
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void testScript(@EmbeddedDatabase DataSource dataSource)
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throws SQLException, FileNotFoundException {
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try (final Connection connection = dataSource.getConnection()) {
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try (final Statement statement = connection.createStatement();
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final ResultSet resultSet =
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statement.executeQuery(
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new BufferedReader(
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new FileReader(
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"src/main/java/g3501_3600/"
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+ "s3564_seasonal_sales_analysis/"
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+ "script.sql"))
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.lines()
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.collect(Collectors.joining("\n"))
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.replaceAll("#.*?\\r?\\n", ""))) {
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assertThat(resultSet.next(), equalTo(true));
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assertThat(resultSet.getNString(1), equalTo("Fall"));
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assertThat(resultSet.getNString(2), equalTo("Apparel"));
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assertThat(resultSet.getNString(3), equalTo("10"));
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assertThat(resultSet.getNString(4), equalTo("120"));
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assertThat(resultSet.next(), equalTo(true));
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assertThat(resultSet.getNString(1), equalTo("Spring"));
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assertThat(resultSet.getNString(2), equalTo("Kitchen"));
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assertThat(resultSet.getNString(3), equalTo("3"));
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assertThat(resultSet.getNString(4), equalTo("54"));
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assertThat(resultSet.next(), equalTo(true));
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assertThat(resultSet.getNString(1), equalTo("Summer"));
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assertThat(resultSet.getNString(2), equalTo("Tech"));
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assertThat(resultSet.getNString(3), equalTo("5"));
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assertThat(resultSet.getNString(4), equalTo("100"));
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assertThat(resultSet.next(), equalTo(true));
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assertThat(resultSet.getNString(1), equalTo("Winter"));
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assertThat(resultSet.getNString(2), equalTo("Apparel"));
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assertThat(resultSet.getNString(3), equalTo("9"));
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assertThat(resultSet.getNString(4), equalTo("110"));
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assertThat(resultSet.next(), equalTo(false));
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}
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}
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}
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}

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