Forum Discussion

DataGuy2016's avatar
DataGuy2016
Advocate IV
9 years ago
Solved

Table Merge creates duplicate records

Hi Folks,   I am stumped.   I am trying to merge two tables into a new table using a LEFT JOIN.  Both tables have unique records on each row.  When I join the tables, BI creates duplicate rows on...
Need Help
  • DataGuy2016's avatar
    DataGuy2016
    9 years ago

    The problem lay with the Data.

     

    The LEFT JOIN functionality of PowerBI works perfectly.

Anonymous's avatar
Anonymous
Not applicable
8 years ago

I am having the same problem with my data.  And no, I do not understand your answer to "expand as an aggregate," will you please clarify?

 

I know this is an old thread, but if someone else is still reading this thread and would like to offer help, I appreciate it!

 

 

J_R_Cribb's avatar
J_R_Cribb
Helper I
8 years ago

Hi Anonymous, 

 

I have created a quick sample that I hope helps explain my method. It may not work with your data, but it did fix the issue with mine!

 

I have two tables, I would like to merge 'Customer Type' with 'Customer Name'.

 

Customer Name Table

 

Customer Type Table

 

I would like to merge using the 'ID' column in both, to bring in the 'Cust Type' field from table 'Customer Type' into table 'Customer Name'.

 

 

 Merge Options

 

 

Once successfully merged, I see the below:

 I now have the option to expand that column of the merged table to bring in data from the 'Customer Type' table. But this is where I choose to Aggregate a field rather than expand. You may require a different aggregate measure other than median, dependant on data type:

 

Expand as Aggregate

 

The result from my data is below:

 

Result

 

Please also see sample.pbix file which I hope can help you with your issue.