Power Pivot Principles: The A to Z of DAX Functions – COUNTBLANK
20 September 2022
In our long-established Power Pivot Principles articles, we continue our series on the A to Z of Data Analysis eXpression (DAX) functions. This week, we look at COUNTBLANK.
The COUNTBLANK function
When I explain this function sometimes I get BLANK() expressions from the audience…
Aw shoot, I will try to explain regardless.
The COUNTBLANK function counts the number of blank cells in a column (field). It employs the following syntax to operate:
The COUNTBLANK function has just the one argument:
- column: this is required and represents the column (field) that (possibly) contains the blank cells to be counted.
It should be further noted that:
- the function returns a whole number (integer). If no rows are found that meet the condition (i.e. the value is blank), blanks are returned instead
- the only argument allowed to this function is a column (field). You may use columns containing any type of data, but only blank cells are counted. Cells that have the value zero  are not counted, as zero is considered a numeric value and not a blank
- whenever there are no rows to aggregate, the function returns a blank. However, if there are rows, but none of them meet the specified criteria, the function returns zero . Microsoft Excel also returns a zero if no rows are found that meet the conditions
- therefore, if the COUNTBLANK function finds no blanks, the result will be zero, but if there are no rows to check, the result will be blank
- any empty string is considered as a blank for COUNTBLANK purposes, even though ISBLANK would return FALSE for an empty string
- this function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.
The following expressions are similar (semantically) to
Where the columns do not contain text strings:
Where the columns contain text strings:
The CALCULATE alternatives may calculate faster than the COUNTBLANK counterpart.
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