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Helper I
Helper I

Help Writing DAX Expression Need to count number of values in a table, but ignore duplicate rows

Hello all, 


I utilize power BI for reporting in my role, and I need help writing a DAX expression.  I work in a call center. And we are able to export data from our ticketing system. This ticketing system generates a unique incident number for each ticket created. We also have a knowledge base that we use in our department with various knowledge articles (KBA Title), if a team member follows a spcifiec knowledge article (KBA Title) when working/ or troubleshooting an issue, they are supposed to pin the knowledge article to the incident number in our ticketing system. I need to calculate the percentage of how many knowledge articles are pinned compaired to incident numbers created.


Step 1 of this is to figure out how many knowledge articles are pinned. When reviewing the data I've found that sometime the rows are duplicating/ showing multiple rows with the same incident and KBA Title. If multiple KBA Titles are used on the same Incident Number, that's fine. but I need to ignore duplicate rows with the same Incident Number and same KBA Title when counting.  



Below is an example data source. I added the KBA Count column manually to illustrate what I am trying to acomplish. In red text is an example of the duplicated rows I need to ignore in counting. I count the first occurance, but do not count the second. 


PinnerKBA TItleIncident NumberLast Modified DateINC SubmitterKBA Pinned by TK CreatorINC Submit DateKBA Count
3040887KBA00003155INC00000094313710/29/2023 9:523040887110/29/2023 0:091
3040887KBA00006728INC00000094314010/29/2023 10:203040887110/29/2023 0:101
3040887KBA00000969INC00000094315110/29/2023 11:253040887110/29/2023 0:111
3040887KBA00001225INC00000094319310/29/2023 13:043040887110/29/2023 0:131
3040887KBA00002905INC00000094319310/31/2023 14:483040887110/29/2023 0:131
3040887KBA00006728INC00000094330410/29/2023 10:393040887110/29/2023 0:101
3040887KBA00002760INC00000094333010/29/2023 12:303040887110/29/2023 0:121
3040887KBA00001330INC00000094333710/29/2023 12:433040887110/29/2023 0:121
3040887KBA00003689INC00000094638610/31/2023 9:453040887110/31/2023 0:091
3040887KBA00001225INC00000094639410/31/2023 9:553040887110/31/2023 0:101
3040887KBA00002905INC00000094639410/31/2023 14:483040887110/31/2023 0:101
3040887KBA00001511INC00000094761711/1/2023 4:333040887111/1/2023 0:041
3040887KBA00002629INC00000094762111/1/2023 5:083040887111/1/2023 0:051
3040887KBA00002555INC00000094762111/1/2023 5:083040887111/1/2023 0:051
3040887KBA00001448INC00000094762411/1/2023 5:423040887111/1/2023 0:051
3040887KBA00003389INC00000094762811/1/2023 6:163040887111/1/2023 0:061
3040887KBA00001123INC00000094764311/1/2023 7:513040887111/1/2023 0:071
3040887KBA00006215INC00000094764711/1/2023 7:563040887111/1/2023 0:071
3040887KBA00000969INC00000094768211/1/2023 9:423040887111/1/2023 0:091
3040887KBA00000969INC00000094768211/1/2023 9:423040887111/1/2023 0:090
3040887KBA00005305INC00000094770011/1/2023 10:143040887111/1/2023 0:101
3040887KBA00004268INC00000094809611/1/2023 10:453040887111/1/2023 0:101
3040887KBA00003389INC00000094850911/1/2023 11:143040887111/1/2023 0:111
3040887KBA00001364INC00000094854311/1/2023 12:133040887111/1/2023 0:121
3040887KBA00001364INC00000094854311/1/2023 12:133040887111/1/2023 0:120
3040887KBA00001381INC00000094903111/2/2023 4:233040887111/2/2023 0:041
3040887KBA00005305INC00000094903411/2/2023 4:583040887111/2/2023 0:051
3040887KBA00003997INC00000094972111/2/2023 9:253040887111/2/2023 0:091
3040887KBA00001225INC00000094972811/2/2023 9:363040887111/2/2023 0:091
3040887KBA00002889INC00000094972811/2/2023 9:383040887111/2/2023 0:091
3040887KBA00003145INC00000094974311/2/2023 10:063040887111/2/2023 0:101
3040887KBA00003145INC00000094990211/2/2023 11:133040887111/2/2023 0:111


The total for this data should be 30 KBAs. However, I cannot get the DAX to display that information. I am using Distinct count and Count to try and calculate the data. I don't know of a better way to model the data  so I can automatically generate the KBA count column. 


Got this from a separate PBI Forum post that sounded close. It is returning a count of all Incident Numbers 

KBA Use Count 2 = CALCULATE(DISTINCTCOUNT('KBA Linked to Incidents CSV'[Incident Number]), 'KBA Linked to Incidents CSV'[KBA Pinned by TK Creator]=1, FILTER(SUMMARIZE(VALUES('KBA Linked to Incidents CSV'[KBA ID]),"ABCD", COUNTROWS('KBA Linked to Incidents CSV')), [ABCD]>1))


This is me throwing things together after trying to talk it out. 

KBA Use Count 5 = CALCULATE(DISTINCTCOUNT('KBAs Linked to Incidents CSV'[KBA TItle]), DISTINCT('KBAs Linked to Incidents CSV'[Incident Number]), 'KBAs Linked to Incidents CSV'[Pinned by Submitter]=1


I am at a loss so reaching out for assistance. 


Thanks for everyone's time! 

Helper I
Helper I

Thank you for this great explanation. Unfortunately it is not what I need. There will be duplicate KBA IDs because the same KBA will be used for different Incidents. I need to count the first occurance of an incident number and KBA ID together and ignore any other rows with the same incident number - KBA combo.  

Community Support
Community Support

Hi @Douttful ,

If you only need to count the number of unique KBA Titles,
The following DAX will help you tag each KBA Title, with the first occurrence marked as 1 and the repeated occurrence marked as 0:

Column = IF(
            'Table'[KBA TItle] = EARLIER('Table'[KBA TItle]) &&
            'Table'[Index] < EARLIER('Table'[Index])
    ) > 0,

And the final output is shown in the following figure:


'Index' is an index column created in Power Query that starts from 1 to mark the order of precedence:


You can then use this DAX to count:

KBA count = 

And the final output is shown in the following figure:


Best Regards,

Dino Tao

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

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