What are common SQL errors in data analysis and how do you troubleshoot them?

Scenario: Imagine you are working on a sales analysis project for a retail store. You’ve been given access to their sales database, which contains tables for customers, products, and sales transactions. Your goal is to gain insights into customer preferences, product performance, and overall sales trends.  In this scenario, you might encounter the following common […]

How do you use joins in SQL?

Imagine you work at a manufacturing company and you are responsible for analyzing the performance of various products. Your database has two tables: product information (products) and sales data (sales). Your task is to combine data from both tables to gain insights and improve decision-making. SQL joins can be incredibly helpful in this situation, as […]

How do you use aliases in SQL?

Imagine you’re working at a retail company, and you’ve been asked to analyze the sales data to find the total revenue and average order value for each product category. You have two tables – ‘orders’ and ‘products.’ The ‘orders’ table contains information about each order, including the order ID, product ID, and revenue. The ‘products’ […]