SQL Beyond the Basics: Joins, Functions, and Windowing

Ready to move past simple database queries and unlock the true power of relational data? Understanding how to combine datasets and perform complex calculations is essential for modern data analysis and database management. This written course guides you step-by-step through essential mid-level SQL techniques, giving you the skills to query multi-table databases and transform raw data into actionable insights. What you will learn: Understand foundational relational database terminology and query execution logic; Combine data across multiple tables using inner, outer, and cross JOIN operations as well as UNIONs; Manage edge cases and missing data effectively using NULL logic and conditional functions; Apply built-in string, numeric, and date functions to clean and convert raw data; Utilize window functions to calculate running totals, rankings, and moving averages across row subsets; Structure complex queries cleanly using Common Table Expressions for maximum readability. You will start with essential definitions and logical query concepts before advancing through practical table combination techniques. From there, you will explore built-in scalar and aggregate functions, handle missing values, and master modern windowing clauses through clear written explanations and detailed code snippets. This course is ideal for beginners who understand basic SELECT statements and want to build practical, real-world database querying skills. Start reading today to take your data handling capabilities to the next level.