Grouped count vs. Grouped Sum

[Applicable88]

Hello,

I'm a former qlik user. I have a grouping function which reats differently to the one from qlik. I have a sample table with unique serialnumbers, but only two different dates:

Serialnumber	Timestamp
BF33333	06.05.20
BF33334	06.05.20
BF33335	06.05.20
BF33336	06.05.20
BF33337	06.05.20
BF33338	07.05.20
BF33339	07.05.20
BF33340	07.05.20
BF33341	07.05.20
BF33342	07.05.20

So when I'm grouping them with a count functions I should get  5 counts per date, means two rows.  In qlik the gouping function aggr() is a virtual table:

aggr(count(Serialnumber),Timestamp))

If I just want the count of how many different rows I get from that virtual table I just add another count there:

count(aggr(count(Serialnumber),Timestamp)) which returns a 2 (count of the grouped rows=2)

If I want to sum up the amount of counts in that virtual table I add a sum there:

sum(aggr(count(Serialnumber),Timestamp)) which returns a 10 (5+5 Serialnumbers per Date)

I tried to emulat this behaviour in PowerBi:

Measure2 = COUNTX(summarize(Table,Tabelle1[Serialnumber],Tabelle1[Timestamp]),Distinctcount(Table1[Serialnumber]))

returns 10

and

Measure = SUMX(summarize(Table1,Tabelle1[Serialnumber],Tabelle1[Timestamp]),Distinctcount(Table1[Serialnumber])) 

returns 100.

What does DAX compute here and how to get the same result like in Qlik?

Thank you very much in advance.

Best. 

[amitchandak]

@Applicable88 , Not pretty sure I got it. Try a measure like

sumx(values(Table[Timestamp]), calculate(DistinctCount(Table[Serialnumber])))

[Applicable88]

Hi @amitchandak ,

I just tried with yours. I get also 10. (Measure 3) The Value() function doesn't solve this. I dont understand why the distinct part  doesn't work out. Values is also distinct but it still counts ever row. 

I also double checked this with dax editor. Shouldn't the summarize function and also the values function part of the function group the timestamp date to only two rows?

I tried with group by as well in DaxEditor and it still counts every row:

EVALUATE
GROUPBY(Tabelle1,Tabelle1[Serialnumber],Tabelle1[Timestamp],"name",COUNTx(CURRENTGROUP(),1))

[v-kkf-msft · Accepted solution]

Hi @Applicable88 ,

The result returned by the DAX formula depends on its context. Try the following formula:

Measure = 
var Per_Group_Rows = 
    CALCULATE(
        COUNT('Table'[Serialnumber]),
        FILTER(
            ALL('Table'),
            'Table'[Timestamp] = MAX('Table'[Timestamp])
        )
    )
return 
    IF(
        ISFILTERED('Table'[Timestamp]),
        Per_Group_Rows,
        DISTINCTCOUNT('Table'[Timestamp])
    )

Measure 2 = COUNT('Table'[Serialnumber])

If the problem is still not resolved, please provide detailed error information or the expected result you expect. Let me know immediately, looking forward to your reply.

Best Regards,
Winniz

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.