Summary  
This chapter covers how to implement code using time-intelligence functions (TOTALYTD, SAMEPERIODLASTYEAR, CALCULATE, DIVIDE) to create measures for cumulative year-to-date values, prior-year comparisons, and year-over-year dollar and percentage changes, plus how to sort time hierarchies using numeric keys.

General domain of usage  
Business intelligence dashboards

Time intelligence is what separates a basic report from a dashboard that actually drives decisions. In this chapter, you'll write four time-based measures: Sales YTD (cumulative year-to-date revenue), Sales PY (same period last year), YoY Change (the dollar difference), and YoY Pct Change (the percentage difference).

You write the measure `Sales YTD = TOTALYTD([Total Sales], 'Date'[Date])`. A user selects `March 2024` in a slicer. What period does `Sales YTD` cover?

Master the skills needed to turn raw data into professional, interactive reports using Power BI. You'll connect to data sources, clean and transform data with Power Query, build data models, write DAX measures, and publish polished dashboards to Power BI Service. No prior experience required.

Get hands-on experience with Power BI Desktop: understand where it fits in the modern data stack, install it, explore the interface, connect to your first dataset, and build your first bar chart.

Master the skills needed to clean, transform, and combine data using Power Query – from filtering rows and adding columns to merging tables and reshaping data with pivot operations.

Explore the essentials of relational data modeling and DAX – build star schemas, define relationships, write measures, and use time intelligence functions to answer real business questions.

Dive into the fundamentals of Power BI visuals – choose the right chart type, configure slicers and filters, add drillthrough navigation, and create bookmark-driven interactive experiences.

Transform the way you present data by applying layout and design principles, building multi-page reports, setting up row-level security, and publishing to Power BI Service with scheduled refresh.

Gain a solid understanding of the end-to-end Power BI workflow by completing a guided project – from data preparation and modeling to building a multi-page dashboard and publishing it to the Service.

Time Intelligence