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The Difference between Duplicate and Reference in Power Query
- Power Query offers Duplicate and Reference features for loading data twice with distinctions in functionality.
- Duplicate copies M-Code to create a new table, while Reference creates a new table based on an existing one.
- SQL Profiler and Power Query Diagnostics are tools used to analyze the behavior of these features.
- When creating a Duplicate, the data is retrieved twice with separate connections, as shown in SQL Profiler.
- Creating a Reference also results in the data being read twice, indicating no difference in load traffic compared to Duplicate.
- The key difference is that Duplicate creates an independent new table, whereas Reference is based on the outcome of the referenced table.
- Reference is suitable for extracting subsets without affecting the original table, while Duplicate is needed for operations like merging tables due to circular references.
- Consider potential conflicts during data loading, especially from sources like Excel, where adjusting settings for parallel loading may be necessary.
- In conclusion, there is no difference in load performance between Duplicate and Reference in Power Query as both load data independently.
- Understanding the distinctions between these features is vital for efficient data loading and transformation processes in Power Query.
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