Data warehousing principles solve real business problems. In this final installment of our drill-across series, we explore how fact tables, dimension tables, and aggregation tables transform complex reporting challenges into manageable solutions. Moving beyond operational database limitations, we demonstrate how Ralph Kimball’s dimensional modeling approach creates scalable, maintainable reporting systems that support agile development practices. We focus on the conceptual foundations that make drill-across queries possible, revealing how seemingly tedious implementation details actually embody powerful principles that free developers from repetitive query optimization while ensuring consistent, reliable results across disparate data sources. by Edward Barnard