Daily DAX : Day 34 INFO.RELATEDCOLUMNDETAILS

 This is an informational DAX function that returns a table showing Relationship details. Uses the TMSSchema_Related_Column_Details Data  Management View


Real-world example:

Imagine you're working with a sales dataset that has two tables:

  1. SalesOrders: Contains information about sales orders, including order ID, customer ID, and order date.
  2. Customers: Contains information about customers, including customer ID, customer name, and region.

There's a one-to-many relationship between Customers and SalesOrders based on the Customer ID column.

Using INFO.RELATEDCOLUMNDETAILS:

To get detailed information about this relationship, you can use the following DAX formula:


INFO.RELATEDCOLUMNDETAILS(RELATEDTABLE(SalesOrders)[Customer ID])


This formula will return a table with the following columns:

  • TABLE_NAME: The name of the related table (SalesOrders)
  • COLUMN_NAME: The name of the related column (Customer ID)
  • CARDINALITY: The cardinality of the relationship (one-to-many)
  • CROSSFILTERING_DIRECTION: The direction of the cross-filtering (single)

Why is this useful?

  • Understanding relationships: It helps you visualize the relationships between tables and columns, especially in complex data models.
  • Troubleshooting issues: If you're encountering unexpected results in your calculations, checking the relationship details can help identify potential problems.
  • Optimizing performance: Understanding the cardinality of relationships can help you optimize your DAX queries and improve performance.

Additional Considerations:

  • Context: The INFO.RELATEDCOLUMNDETAILS function is context-sensitive. It will return information based on the current row context.
  • Error handling: If the related table or column doesn't exist, or if there's an issue with the relationship, the function might return an error.

By effectively using INFO.RELATEDCOLUMNDETAILS, you can gain deeper insights into your data model and improve the accuracy and efficiency of your DAX calculations.


https://dax.guide/info-relatedcolumndetails/


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