Measures:
Dynamic Calculations: Measures are dynamic calculations that aggregate data based on specific conditions or criteria.
Computed On-the-Fly:
Unlike calculated columns (which create static values for each row), measures compute results on the fly during visualization.
Aggregations: Measures are typically used for aggregations, such as sums, averages, counts, or ratios.
Examples: Total sales, average sales per customer, profit margins, KPIs, and time-related calculations (e.g., year-to-date sales).
Calculated Tables:
New Tables: Calculated tables are new tables created within a data model based on data from different sources.
Results of Expressions: They present the results of specific calculations or expressions.
Use Cases: Calculated tables are useful when you need to create additional dimensions or hierarchies beyond what’s available in your original data.
Example: Creating a table with date ranges (e.g., quarters, months) for time-based analysis.
When to Use Each:
Measures: Use measures when you want to perform calculations on existing data, especially for visualizations (charts, tables, cards).
Calculated Tables: Use calculated tables when you need to create new dimensions, hierarchies, or custom groupings.
In summary, measures enhance interactivity in your reports, while calculated tables provide additional context or dimensions for analysis. Both play essential roles in building robust Power BI models!