Daily DAX : Day 437 GCD

Power BI DAX Function: GCD

The GCD (Greatest Common Divisor) function in DAX returns the largest positive integer that divides two integers without leaving a remainder. It is a mathematical function similar to Excel's GCD.

Syntax

GCD(number1, number2)
  • number1, number2: Integer values (or expressions evaluating to integers). Only two arguments are supported.

Return Value

An integer representing the greatest common divisor.

Remarks & Limitations

  • Returns #VALUE! if any argument is non-numeric.
  • Returns #NUM! if any argument is less than 0 or >= 2^53.
  • Not supported in DirectQuery mode for calculated columns or row-level security (RLS).
  • The function is considered deprecated in some contexts, but still available.

Examples

ExpressionResultExplanation
GCD(12, 18)66 divides both 12 and 18 evenly.
GCD(7, 13)17 and 13 are prime to each other.
GCD(48, 18)6Largest common divisor is 6.
GCD(5, 0)5GCD with 0 is the number itself (if positive).

Use Cases

The GCD function is niche in business intelligence but useful in specific scenarios:

  • Fractions simplification: Reduce ratios (e.g., divide numerator and denominator by GCD).
  • Calculating Least Common Multiple (LCM): LCM(a, b) = ABS(a * b) / GCD(a, b).
  • Scaling or grouping data: Find common factors for dimensions like sizes, quantities, or time intervals.
  • Manufacturing/Inventory analysis: Optimize packaging or batch sizes based on common divisors.
  • Educational or mathematical models: In reports involving number theory or algorithms.

For more than two numbers, nest the function: GCD(GCD(a, b), c).


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