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Data Analysis Expressions (DAX) is a formula expression language used in Power BI, Analysis Services, and Power Pivot in Excel to perform calculations and queries on data models. It combines functions, operators, and values to create formulas that work across related tables and columns, helping businesses transform existing data into meaningful information for analysis and reporting.

With DAX, organizations can create measures, calculated columns, calculated tables, and row-level security expressions for more advanced data analysis. Its dynamic measures can respond to the context of reports, including filters and selections, making DAX particularly useful for building analytical models and interactive business intelligence reports in Power BI.

DAX

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KEY FEATURES
  • Dynamic Calculations
    DAX enables dynamic calculations that respond to the context of reports, including filters and selections in Power BI and Excel PivotTables.

    • Context-aware measures
    • Dynamic results
    • Flexible calculations
  • Advanced Data Modeling
    DAX formulas work with related tables and columns to perform calculations across tabular data models.

    • Related table calculations
    • Calculated columns
    • Calculated tables
  • Rich Function Library
    DAX provides a library of functions and operators that can be combined to build calculation formulas and expressions.

    • Built-in functions
    • Formula expressions
    • Powerful operators
  • Row-Level Security
    DAX expressions can be used to define row-level security within supported data models.

    • Data access rules
    • Security expressions
    • Model-level control
COMMON USE CASES
  • KPI Calculations
    Use DAX measures to calculate business metrics that dynamically respond to filters and report context.
  • Calculated Columns
    Create calculated columns to derive additional values from data stored within tabular models.
  • Calculated Tables
    Use DAX formulas to create calculated tables that support analytical data models and reporting requirements.
  • Interactive Report Analysis
    Build calculations that change according to user selections, slicers, and filters in
    Power BI reports.
  • Cross-Table
    Calculations
    Perform advanced calculations and queries using data from related tables and columns within a data model.
  • Row-Level
    Security
    Use DAX expressions to define row-level security rules and control which data is available within supported models.
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