Case Studies in SQL: Real-World Data Analysis with SQL Queries

SQL (Structured Query Language) is a powerful tool for working with data, and it’s widely used in various industries for data analysis and decision-making. In this guide, we’ll explore real-world case studies that demonstrate the practical use of SQL queries to analyze data and derive valuable insights. Let’s dive into some intriguing scenarios with practical code examples.

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Case Study 1: Retail Sales Analysis

Problem Statement:

A retail company wants to analyze its sales data to identify top-selling products, sales trends over time, and customer demographics.

SQL Queries:

Top-Selling Products:

SELECT product_name, SUM(quantity) as total_sold FROM sales GROUP BY product_name ORDER BY total_sold DESC LIMIT 10;

Sales Trends Over Time:

SELECT DATE_FORMAT(order_date, '%Y-%m') as month, SUM(amount) as total_sales FROM orders GROUP BY month ORDER BY month;

Customer Demographics:

SELECT gender, AVG(age) as average_age FROM customers GROUP BY gender;

Case Study 2: Healthcare Analytics