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Detecting Data Changes in Power BI Incremental Refresh

Chris Webb writes some M:

One feature of Power BI incremental refresh I’ve always been meaning to test out is the ability to create your own M queries to work with the “detect data changes” feature, and last week I finally had the chance to do it. The documentation is reasonably detailed but I thought it would be a good idea to show a worked example of how to use it to get direct control over what data is refreshed during an incremental refresh.

Read on to see how it works, including a couple gotchas around things like the shape of query results.

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