ODBC Custom Connector Dialect

Hi BL123456 ,

In Power BI, there isn’t a direct way to provide a dialect to a custom connector like you can in Tableau. However, Power BI provides several ways to aggregate or transform data.

Custom SQL Queries: You can write custom SQL queries in Power BI to control the data retrieval process. This can be done in the SQL Server Connector.

Tutorial: Connect to on-premises data in SQL Server - Power BI | Microsoft Learn

DAX Measures and Calculated Columns: Using Data Analysis Expressions (DAX), you can create custom measures and calculated columns to control how data is aggregated and displayed.

Measures in Power BI Desktop - Power BI | Microsoft Learn

Tutorial: Create calculated columns in Power BI Desktop - Power BI | Microsoft Learn

Query Folding: Ensure that your custom connector supports query folding. Query folding is the process where Power BI translates its internal queries into the native queries of the data source. This can help optimize performance and ensure that the logic is pushed down to the data source.

Query folding guidance in Power BI Desktop - Power BI | Microsoft Learn

Power Query M Language: You can use the M language in Power Query to transform and shape your data before it is loaded into Power BI. This allows you to apply specific logic and transformations at the data retrieval stage.

While these methods don’t provide a direct dialect feature like Tableau, they offer flexibility in controlling and customizing the data retrieval and visualization process in Power BI.

Best Regards,

Stephen Tao

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