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UsePowerBI
Post Prodigy
Post Prodigy

How to flag duplicates with DAX?

Hello

 

Is there a way to create a calculated column which will put a flag when the entry has a duplicate value in a specific column?

 

E.g.

 

A, FLAGGED

A, FLAGGED

B, NOT FLAGGED

 

Thanks!

1 ACCEPTED SOLUTION
parry2k
Super User
Super User

@UsePowerBI try something like this

 

Is Duplicste = 
VAR __cnt = CALCULATE ( COUNTROWS ( Table ), ALLEXCEPT ( Table, Table[Column] ) )
RETURN
IF ( __cnt > 1, "Flagged", "Not Flagged" )

 

I would  Kudos if my solution helped. 👉 If you can spend time posting the question, you can also make efforts to give Kudos whoever helped to solve your problem. It is a token of appreciation!

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View solution in original post

5 REPLIES 5
parry2k
Super User
Super User

@UsePowerBI try something like this

 

Is Duplicste = 
VAR __cnt = CALCULATE ( COUNTROWS ( Table ), ALLEXCEPT ( Table, Table[Column] ) )
RETURN
IF ( __cnt > 1, "Flagged", "Not Flagged" )

 

I would  Kudos if my solution helped. 👉 If you can spend time posting the question, you can also make efforts to give Kudos whoever helped to solve your problem. It is a token of appreciation!

Visit us at https://perytus.com, your one-stop shop for Power BI related projects/training/consultancy.



Subscribe to the @PowerBIHowTo YT channel for an upcoming video on List and Record functions in Power Query!!

Learn Power BI and Fabric - subscribe to our YT channel - Click here: @PowerBIHowTo

If my solution proved useful, I'd be delighted to receive Kudos. When you put effort into asking a question, it's equally thoughtful to acknowledge and give Kudos to the individual who helped you solve the problem. It's a small gesture that shows appreciation and encouragement! ❤


Did I answer your question? Mark my post as a solution. Proud to be a Super User! Appreciate your Kudos 🙂
Feel free to email me with any of your BI needs.

@parry2k 

thanks, can you tell me please why ALLEXCEPT is necessary? 

@UsePowerBI ALLEXCEPT remove all other filters except the one that is in the column.



Subscribe to the @PowerBIHowTo YT channel for an upcoming video on List and Record functions in Power Query!!

Learn Power BI and Fabric - subscribe to our YT channel - Click here: @PowerBIHowTo

If my solution proved useful, I'd be delighted to receive Kudos. When you put effort into asking a question, it's equally thoughtful to acknowledge and give Kudos to the individual who helped you solve the problem. It's a small gesture that shows appreciation and encouragement! ❤


Did I answer your question? Mark my post as a solution. Proud to be a Super User! Appreciate your Kudos 🙂
Feel free to email me with any of your BI needs.

@parry2k 

 

Thanks but why is this necessary? Why do we need to remove any applied filters on the table apart from that column?

 

I am not aware of applying any filters in the table.

 

Why cannot we just use:

 

IF ( CALCULATE ( COUNTROWS ( Table ), Table[Column] ) ) > 1, "DUPLICATE","NOT DUPLICATE")

@UsePowerBI currently you have one column and even simple countrows will work but think if you have another column in the table let's say index

 

A 1

A 2

B 3

 

now simple countrows will not work, you will get count of 1 for each row because every row is unique now so using allexcept will only keep the filter on name column (A,B) and remove any other row-level filter. Make sense?

 

I would  Kudos if my solution helped. 👉 If you can spend time posting the question, you can also make efforts to give Kudos whoever helped to solve your problem. It is a token of appreciation!

Visit us at https://perytus.com, your one-stop shop for Power BI related projects/training/consultancy.

 

 



Subscribe to the @PowerBIHowTo YT channel for an upcoming video on List and Record functions in Power Query!!

Learn Power BI and Fabric - subscribe to our YT channel - Click here: @PowerBIHowTo

If my solution proved useful, I'd be delighted to receive Kudos. When you put effort into asking a question, it's equally thoughtful to acknowledge and give Kudos to the individual who helped you solve the problem. It's a small gesture that shows appreciation and encouragement! ❤


Did I answer your question? Mark my post as a solution. Proud to be a Super User! Appreciate your Kudos 🙂
Feel free to email me with any of your BI needs.

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