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Helper II
Helper II

Need to calculate distinct count of customers only if the count is greater then one

Hello Power BI community!

 

I have what looks to be a simple task. I have a table with restaurant reservations. I need to find the repeating customers. In other words I need to do counts of customers where count > 1. This is what I wrote:

 

Distinct Customers = CALCULATE (
DISTINCTCOUNT ( Resy[Contact_Name__c] ),
FILTER(Resy, DISTINCTCOUNT(Resy[Contact_Name__c] ) > 1)
)
 
Contact_Name__c is a unique customer identifier. If I drop that measure in a matrix my numbers are way to high. 
 ResyDistinct.png
 

If I do the same calculation in SQL Server I get:

SQLDistinct.png

T-SQL 

SELECT DISTINCT COUNT(ContactName), Venue
FROM
(
SELECT COUNT(Contact_Name__c) CNT, Contact_Name__c AS ContactName, Venue_Name__c AS Venue
FROM [AnalyticsBI].[sf].[Resy]
GROUP BY Contact_Name__c, Venue_Name__c
HAVING COUNT(Contact_Name__c) > 1
) sql1
GROUP BY Venue

 

 

Does anybody have any idea why the counts are off?

Thanks!

Stan

 

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted
Resolver IV
Resolver IV

Re: Need to calculate distinct count of customers only if the count is greater then one

Hi @zaichusha,

 

Might be able to help on this one. The reason your numbers are too high is likely because your haven't initiated context transition in your FILTER statement. FILTER iterates row-by-row and will be putting the value of the DISTINCTCOUNT of customers in every row (this is always going to be > 1 unless you have 1 or zero customers). Try this

 

Distinct Customers =
COUNTROWS(
    FILTER(
        VALUES( Resy[Contact_Name__c] ),
        CALCULATE( COUNTROWS( Resy ) ) > 1
    )
)

 

Effectively this formula create a table with the unique list of Contact_Name_c (the VALUES) and iterates over this keeping the Contact_Name_c where there is more than 1 row in the table. The COUNTROWS then counts these up.

 

Hope it helps.

 

Kris

View solution in original post

2 REPLIES 2
Highlighted
Resolver IV
Resolver IV

Re: Need to calculate distinct count of customers only if the count is greater then one

Hi @zaichusha,

 

Might be able to help on this one. The reason your numbers are too high is likely because your haven't initiated context transition in your FILTER statement. FILTER iterates row-by-row and will be putting the value of the DISTINCTCOUNT of customers in every row (this is always going to be > 1 unless you have 1 or zero customers). Try this

 

Distinct Customers =
COUNTROWS(
    FILTER(
        VALUES( Resy[Contact_Name__c] ),
        CALCULATE( COUNTROWS( Resy ) ) > 1
    )
)

 

Effectively this formula create a table with the unique list of Contact_Name_c (the VALUES) and iterates over this keeping the Contact_Name_c where there is more than 1 row in the table. The COUNTROWS then counts these up.

 

Hope it helps.

 

Kris

View solution in original post

Highlighted
Helper II
Helper II

Re: Need to calculate distinct count of customers only if the count is greater then one

Kris, that did the trick! Thank you! I will still have to grasp the DAX.

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