Used within another function to return an array of unique values in a range.
Sample Usage
COUNT(DISTINCT([First Results]:[Second Results]))
  • range
  • range
    The group of cells to evaluate.
Usage Notes

All values must be of the same data type in order for the function to calculate. 

For example, 1, 2, a, 2 will produce a value of 1 if counted. 1, 2, 2, 3 will produce a value of 3 because only 1, 2, 3 are distinct. 

DISTINCT can only reference one data type at a time. For example, if the referenced range includes text values and numeric values, you'll see an INVALID DATA TYPE error.

To ensure that DISTINCT only references one data type, consider using COLLECT:
=COUNT(DISTINCT(COLLECT({Range 1}, {Range 1}, ISNUMBER(@cell))))