Power Pivot Principles: The A to Z of DAX Functions – DISTINCT(table)
16 May 2023
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 DISTINCT (table).
The DISTINCT (table) function
The DISTINCT(table) function is one of the table manipulations functions that returns a table containing only the distinct rows. This means that the duplicate rows are removed, and only unique rows are returned. It has the following syntax:
It has just the one  argument:
- table: this is required and represents the table from which unique rows are to be returned or an expression that returns a table.
Here are a few remarks about this function:
- the current filter context has an impact on the results of the DISTINCT(table) function
- this function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules
- there is another version of the DISTINCT(table) function which is the DISTINCT(column) function. The latter function removes the duplicate value for a column or expression that resulted in column.
For example, we can create a simple table using the DATATABLE function in DAX:
It should return the follow table in Excel:
Then we can use the DISTINCT(table) function to wrap around the DAX code to remove duplicate row for this table:
Hence, the code above will result in the following table:
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