Forum Discussion

JonasWesth's avatar
JonasWesth
Frequent Visitor
7 years ago
Solved

Identify rows with duplicate values

I am new with Power BI and DAX, and hope the community can help with this specific issue.    The purpose is to identify potential duplicate invoices, which are registrered under a different invoice...
  • Anonymous's avatar
    Anonymous
    7 years ago

    Look:

     

    Here's the M code:

    let
    Source = Invoices,

        #"Merged Queries" = Table.NestedJoin(Source, {"Vendor", "Posting Date", "Amount"}, #"Invoices - Duplicate Invoice Marker", {"Vendor", "Posting Date", "Amount"}, "Invoices - Duplicate Invoice Marker", JoinKind.LeftOuter),
    #"Expanded Invoices - Duplicate Invoice Marker" = Table.ExpandTableColumn(#"Merged Queries", "Invoices - Duplicate Invoice Marker", {"Inv No"}, {"Inv No.1"}),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded Invoices - Duplicate Invoice Marker",{"Inv No.1"}),
    #"Grouped Rows" = Table.Group(#"Removed Columns", {"Inv No", "Vendor", "Posting Date", "Amount"}, {{"Count", each Table.RowCount(_), type number}}),
    #"Added Custom" = Table.AddColumn(#"Grouped Rows", "Has Dups", each if [Count] > 1 then "Yes" else "No"),
    #"Removed Columns2" = Table.RemoveColumns(#"Added Custom",{"Count"})
in
    #"Removed Columns2"

    Here are the table dependencies:

     

    Best

    Darek

Anonymous's avatar
Anonymous
Not applicable
7 years ago

Why don't you do this in Power Query where it really should be done? Such calculations belong to Power Query, not DAX, even though, of course, it's possible to do it in DAX.

 

Best

Darek

JonasWesth's avatar
JonasWesth
Frequent Visitor
7 years ago

Thanks for taking your time reviewing my problem!

 

I don't mind using Power Query, but having the specific rows marked, while still retaining all the data, would be greatly preferred. I have a Data Model with many dimension tables and measures, so if at all possible, it would be benificial to just add a new column with "yes" and "no", where "yes" marks the rows which are suspected as duplicates.

 

I tried an If statement in a custom column in power query, but all results are positive:

if [Vendornumber] = [Vendornumber] and
[Amount] = [Amount] and
[Date] = [Date]
then "Yes"
else "No"

 

How would you mark only the rows where alle three criteria are true?

Regards
Jonas