Exploring Hospital Data: Window Functions, Joins, CTEs and Subqueries

The author explores essential SQL concepts using a hospital dataset to enhance data analysis and reporting. The study focuses on four key tools: window functions, joins, common table expressions (CTEs), and subqueries. Specifically, SQL window functions enable calculations across related rows without collapsing results into single summary values, unlike group by. These methods are critical for data analysts to answer pertinent questions regarding hospital visits, departments, patients, and bills while supporting informed organizational decision making.