[PL-300] 12, Grouping and Aggregating Rows

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How single and multiple key combinations dictate table granularity during Group By operations in Power Query. - The role of standard aggregations like Count, Sum, Average, Min, Max, and Count Distinct in data reduction. - How the All Rows operation creates nested tables to retain detail while performing group-level calculations. - Exam strategies for avoiding detail loss traps through merging aggregated tables or expanding nested tables. - M code syntax patterns for Table.Group and performance trade-offs of early data aggregation for the PL-300 exam. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep