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HASONEVALUE Function (DAX)

Returns TRUE when the context for columnName has been filtered down to one distinct value only. Otherwise is FALSE.

HASONEVALUE(<columnName>)

columnName

The name of an existing column, using standard DAX syntax. It cannot be an expression.

TRUE when the context for columnName has been filtered down to one distinct value only. Otherwise is FALSE.

  • An equivalent expression for HASONEVALUE() is COUNTROWS(VALUES(<columnName>)) = 1.

In the following example you want to create a formula that verifies if the context is being sliced by one value in order to estimate a percentage against a predefined scenario; in this case you want to compare Reseller Sales against sales in 2007, then you need to know if the context is filtered by single years. Also, if the comparison is meaningless you want to return BLANK.

If you want to follow the scenario, you can download the spreadsheet with the model from PowerPivot Sample Data spreadsheet.

Create a measure named [ResellerSales compared to 2007] using the following expression:

=IF(HASONEVALUE(DateTime[CalendarYear]),SUM(ResellerSales_USD[SalesAmount_USD])/CALCULATE(SUM(ResellerSales_USD[SalesAmount_USD]),DateTime[CalendarYear]=2007),BLANK())
  1. After creating the measure you should have an empty result under [ResellerSales compared to 2007], as shown below:

    ResellerSales compared to 2007

    The BLANK cell in the result is because you don't have single year filters anywhere in your context.

  2. Drag DateTime[CalendarYear] to the Column Labels box; your table should look like this:

    Column Labels

    2005

    2006

    2007

    2008

    ResellerSales compared to 2007

    24.83 %

    74.88 %

    100.00 %

    50.73 %

  3. Drag ProductCategory[ProductCategoryName] to the Row Labels box to have something like this:

    ResellerSales compared to 2007

    Column Labels

    Row Labels

    2005

    2006

    2007

    2008

    Accessories

    6.74 %

    31.40 %

    100.00 %

    55.58 %

    Bikes

    28.69 %

    77.92 %

    100.00 %

    53.46 %

    Clothing

    3.90 %

    55.86 %

    100.00 %

    44.92 %

    Components

    11.05 %

    65.99 %

    100.00 %

    38.65 %

    Grand Total

    24.83 %

    74.88 %

    100.00 %

    50.73 %

    Did you notice that Grand Totals appeared at the bottom of the columns but not for the rows? This is because the context for Grand Totals on rows implies more than one year; but for columns implies a single year.

  4. Drag DateTime[CalendarYear] to the Horizontal Slicers box, and drag SalesTerritory[SalesTerritoryGroup] to the Horizontal Labels box. You should have an empty results set, because your table contains data for multiple years. Select 2006 in the slicer and your table should now have data again. Try other years to see how the results change.

  5. In summary, HASONEVALUE() allows you to identify if your expression is being evaluated in the context of a single value for columnName.

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