Power BI count null rows

[bombom]

Hi!

I have two columns. Both have a general key INT value called TicketId, but one table has less TicketIds than another table. Each table has different amount of columns.

For example, the current counting of rows looks like this:

Dates	Tab1	Tab2
08.11.2022	1058	950
09.11.2022	1058	1056
22.11.2022	2342	302

I am looking for a DAX measure forluma that will calculate TicketIds that exist in Tab1, but doesn't exist in Tab2. It should be not a formula like 1058 - 950 = 108. Because after there will be drillthrough to show all the TicketIds that were calculated (exist in Tab1 and doesn't exist in Tab2).

Dates	Tab1	Tab2	Tabcross
08.11.2022	1058	950	108
09.11.2022	1058	1056	2
22.11.2022	2342	302	2040

[v-yiruan-msft · Accepted solution]

Hi @bombom ,

You can create a measure as below to get it:

Tabcross =
VAR _tab =
    EXCEPT ( VALUES ( Tab1[TicketId] ), VALUES ( Tab2[TicketId] ) )
RETURN
    COUNTROWS ( _tab )

If the above one can't help you get the desired result, please provide some sample data in your table 'Tab1' and 'Tab2' (exclude sensitive data) with Text format and your expected result with backend logic and special examples. It is better if you can share a simplified pbix file. You can refer the following link to upload the file to the community. Thank you.

How to upload PBI in Community

Best Regards

[Nishudhan]

Hi,

Can you try left anti join -(which returns all the records from left which is not there in right)which is in the power query - Home-Merge as new 

[Nishudhan]

Hi,

you can use set operator - Except

=except(table1,table2)

[bombom]

Hello @Nishudhan ,

Thank you. I tried it, but there is an error: "All table arguments to the "EXCEPT" function must have the same number of columns.". It's true. Each of my tables have different amount of columns. So it looks like this formula wouldn't work...