Power Pivot Principles: The A to Z of DAX Functions – COUNTROWS
27 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 COUNTROWS.
The COUNTROWS function
The COUNTROWS function counts the number of rows in the specified table or in a table defined by an expression.
It employs the following syntax to operate:
The COUNTROWSfunction has just the one argument:
- table: this argument is optional and represents the name of the table that contains the rows to be counted or an expression that returns a table. When it has not been provided, the default value is the home table of the current expression.
It should be further noted that:
- the function returns a whole number (integer)
- this function may be used to count the number of rows in a base table, but more often is used to count the number of rows that result from filtering a table, or applying context to a table
- 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
- this function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.
Sometimes, COUNTROWS is used when better syntax may be employed, e.g.
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