SQL Basics - Study Notes with Worked Examples
This notes cover the SQL you need for entry-level data analyst work: reading data, filtering it, summarizing it, joining tables, changing data, and using CTEs and window functions. Each chapter explains the idea, shows a short example, and points out the mistakes beginners make most often.
About the creator
Hi, I’m Arvindh. I work in warehouse and logistics operations, where I build Power BI reports and data tools to track performance and support day-to-day decisions. I’ve also built Python-based AI applications.
🏬 Visit storeFrequently asked questions
Who is this ebook for?
This ebook is designed for beginners, aspiring data analysts, students, and anyone who wants to learn the fundamentals of SQL for data analysis. No advanced programming knowledge is required.
Do I need prior SQL experience?
No. The notes start with the basics and gradually introduce more advanced concepts, making them suitable for readers who are completely new to SQL or want to refresh their existing knowledge.
What will I learn from this ebook?
You will learn how to retrieve, filter, sort, and summarize data; join multiple tables; work with NULL values; modify data; create tables; use subqueries and Common Table Expressions (CTEs); and apply window functions for analytical tasks.
Will this ebook help me prepare for SQL interviews?
It can help you revise important SQL topics frequently tested in entry-level data analyst interviews, including filtering, joins, GROUP BY, HAVING, subqueries, CTEs, and window functions. It should be used alongside additional practice questions and mock interviews.