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DAX creates a blank row to guarantee that results are accurate even if a regular relationship is invalid. The blank row is not created for limited relationships. This video shows the effect of not having a blank row in your tables.
Article and download: sql.bi/785676?aff=yt
How to learn DAX: www.sqlbi.com/guides/dax/?aff=yt
The definitive guide to DAX: www.sqlbi.com/books/the-definitive-guide-to-dax-2nd-edition/?aff=yt