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## How To Count Distinct States Based Distinct PersonsNames

Hi!

I have two columns in a table.  State and PersonsName.  I want to calculate the count of distinct states that contain more than 10 distinct PersonsName.

Almost like how a GROUP BY in SQL would work.

Any ideas on how to accomplish this?

Thank you!

2 REPLIES 2
Memorable Member

Hi,

I made a table with 2 columns (States and PersonName) and gave you 5 options :

1/ In Power Query by making a Group By. Good option if you don't need you data in details. See my first query for that option.

2/ Using DAX, you can make a basic calculation but your totals will be wrong, because of the lack of filter context on totals.

`NbPersonDAX_Mesure = DISTINCTCOUNT(TableStatesPersonDAX[PersonName])`
Works for every lines of your table except for the total.
3/ Using DAX with variable, works on the rows of the table but gives not total, since not current state available :
`NbPersonDAX_Mesure v2 = VAR CurrState=SELECTEDVALUE(TableStatesPersonDAX[States])RETURNCALCULATE(    DISTINCTCOUNT(TableStatesPersonDAX[PersonName]),    TableStatesPersonDAX[States]=CurrState)`
A little better since you do not have a wrong total, but maybe you need the total ?
4/ The solution I would recommend would be :
`NbPersonDAX_Mesure v3 = SUMX( VALUES(TableStatesPersonDAX[States]) ,                             CALCULATE( DISTINCTCOUNT( TableStatesPersonDAX[PersonName] ) ) )`
Do not forget the CALCULATE before DISTINCTCOUNT because it provides the context transition needed in this case. Making the right count on the rows and the good total at the bottom of your table.
Or even better, test the formula with and without the CALCULATE to see by yourself the context transition.
5/ Create a summarized table in DAX with a filter :
`TableDAX_withFILTER = FILTER( SUMMARIZECOLUMNS(TableStatesPersonDAX[States], "NbPersonStates" , DISTINCTCOUNT(TableStatesPersonDAX[PersonName])) ,[NbPersonStates]>2 )`
If you need to display or make many calculations on those synthesis, could be an option as well.

Super User

You can use DAX formula to achieve this in Power BI. Here's an example measure that counts the distinct states that have more than 10 distinct PersonNames:

Distinct States with >10 PersonNames = COUNTROWS( FILTER( SUMMARIZE( Table1, Table1[State], "DistinctPersonNames", DISTINCTCOUNT(Table1[PersonsName]) ), [DistinctPersonNames] > 10 ) )

Here, we use the SUMMARIZE function to group the data by State and calculate the number of distinct PersonNames for each State. Then we use the FILTER function to include only those rows where the count of distinct PersonNames is greater than 10, and finally use the COUNTROWS function to count the number of distinct States that meet this condition.

Replace "Table1" with the name of your actual table and "State" and "PersonsName" with the names of your actual columns.

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