Anti Joins And Query Folding In Power Query In Excel And Power BI
Chris Webb BI
DECEMBER 3, 2023
Power Query allows you to merge (“join” in database terms) two tables together in a variety of different ways, including left and right anti joins. Unfortunately, as I found recently, anti joins don’t fold on SQL Server-related data sources, which can result in performance problems. Luckily there is a different way of doing anti joins that does fold.
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