Forum Discussion
alphanumeric columns
Your ideas is so great rajendraongole1
Hi, powerbiexpert22
Your use of such string columns as join keys does cause performance issues. For this reason, I created the following two tables to test its performance:
The query performance for this state is as follows:
My queries using numeric columns as join keys perform better:
There are performance gaps from small volumes of data, and if we create some metrics for these tables, the performance difference will be even greater. You can choose the right column as a join key depending on the situation you have.
Best Regards
Jianpeng Li
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Hi Anonymous , is there a way to create numeric primary key in power bi? can i use index function to create primary key
Hi, powerbiexpert22
You can use the DAX function to create an Index calculated column to be used as a primary key though. But when you use these two calculated columns to create a relationship between two tables, you are prone to circular dependency issues. Using my previous data as an example, I used the following two DAX expressions to create a calculated column in each of the two tables:
IndexColumn = RANKX(ALL(Customers), 'Customers'[CustomerID], , ASC, DENSE)IndexColumn = RANKX(ALL('Orders'), 'Orders'[CustomerID], , ASC, DENSE)So, I would recommend creating the index column in the data source or in PowerQuery to ensure that there are no circular dependencies.
In the future, if you have any new questions about creating primary key columns, you can post a new thread so that the rest of the community can help you in a timely manner.
Best Regards
Jianpeng Li
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
