Python Script to Find Top-selling Products in Each Region (2023)

This Python script utilizes the sqlite3 library to create a SQLite database, store sales data, and query the database to find the top-selling products in each region for the year 2023 based on total sales revenue.

Python Script Description:

#!/usr/bin/env python

import sqlite3

# Connect to SQLite3 database (it will create the database if it doesn't exist)
conn   = sqlite3.connect('sales_data.db')
cursor = conn.cursor()

# Create the sales table
cursor.execute('''
CREATE TABLE IF NOT EXISTS sales (
    transaction_id INT,
    product_id INT,
    region_id INT,
    sale_date DATE,
    quantity INT,
    price DECIMAL(10, 2)
);
''')

# Insert the sample data
cursor.executemany('''
INSERT INTO sales VALUES (?, ?, ?, ?, ?, ?);
''', [
    (1, 101, 1, '2023-01-05', 100, 10.50),
    (2, 102, 1, '2023-02-10', 150, 15.75),
    (3, 103, 1, '2023-03-15', 200, 20.00),
    (4, 101, 2, '2023-01-05', 120, 11.25),
    (5, 102, 2, '2023-02-10', 180, 18.50),
    (6, 103, 2, '2023-03-15', 220, 22.75),
    (7, 101, 3, '2023-01-05', 80, 9.75),
    (8, 102, 3, '2023-02-10', 100, 12.25),
    (9, 103, 3, '2023-03-15', 150, 17.00)
])

# Commit the transaction
conn.commit()

# SQL query to find the top-selling product in each region for the year 2023
query = '''
WITH 
sales_2023 AS (
    SELECT 
        product_id,
        region_id,
        SUM(quantity * price) AS total_sales_revenue
    FROM 
        sales
    WHERE 
        strftime('%Y', sale_date) = '2023'
    GROUP BY 
        product_id, region_id
),
ranked_sales AS (
    SELECT 
        product_id,
        region_id,
        total_sales_revenue,
        RANK() OVER (PARTITION BY region_id ORDER BY total_sales_revenue DESC) AS rank
    FROM 
        sales_2023
)
SELECT 
    region_id,
    product_id,
    total_sales_revenue
FROM 
    ranked_sales
WHERE 
    rank = 1;
'''

# Execute the query
cursor.execute(query)
results = cursor.fetchall()

# Display the results
print("Top-selling products in each region for 2023:")
for row in results:
    print(f"Region ID: {row[0]}, Product ID: {row[1]}, Total Sales Revenue: {row[2]}")

# Close the connection
conn.close()
Top-selling products in each region for 2023:
Region ID: 1, Product ID: 103, Total Sales Revenue: 4000
Region ID: 2, Product ID: 103, Total Sales Revenue: 5005.0
Region ID: 3, Product ID: 103, Total Sales Revenue: 2550

Explanation:

The script begins by creating a connection to a SQLite database. If the database does not exist, it creates one named sales_data.db. After connecting to the database, the sales table is created with the specified columns: transaction_id, product_id, region_id, sale_date, quantity, and price. The sample data is then inserted into the table.

Once the data is inserted, the script runs an SQL query to calculate the total sales revenue for each product in each region for the year 2023. It uses a window function RANK() to rank the products by their total sales revenue within each region. The script then selects the product with the highest sales revenue in each region and displays the result.

© Kevin Thomas Luzbetak, MSc