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I have a issue whereby when I join two tables i get a many to many relationship. To avoid this is it better to merge the tables or the last time I had this issue I created an extra table with unique values. Linking the two tables to the extra table.
Solved! Go to Solution.
Hi akhaliq7
In the relationships screen you can edit the relationship.
But if your 2 tables do indeed containing many-to-many keys then it wont allow a 1 to many.
The usually workarround is to create a bridge tables.
Simply append the key columns from table1 with the key columns from table2 to create table3.
Remove duplicates from table3.
Then create 1:M relationship from table3 to table1 and table3 to table2 with bi-directional filtering.
When you filter table1 it will filter table2 and vice versa.
There are lots of you tube video on how to handle a many to many with a bridge table.
Or you can merge the two tables into one table with Power Query as you described.
Remember we are BI community voluntrees so please click the thumbs-up for me taking the trouble to help you and then accept the solution if it works. Thank you !
Hi akhaliq7
In the relationships screen you can edit the relationship.
But if your 2 tables do indeed containing many-to-many keys then it wont allow a 1 to many.
The usually workarround is to create a bridge tables.
Simply append the key columns from table1 with the key columns from table2 to create table3.
Remove duplicates from table3.
Then create 1:M relationship from table3 to table1 and table3 to table2 with bi-directional filtering.
When you filter table1 it will filter table2 and vice versa.
There are lots of you tube video on how to handle a many to many with a bridge table.
Or you can merge the two tables into one table with Power Query as you described.
Remember we are BI community voluntrees so please click the thumbs-up for me taking the trouble to help you and then accept the solution if it works. Thank you !
Thanks for taking out the time to write such a detailed response.
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