I'm trying to migrate a report I made in SQL into PowerBI but as I do it I'm finding that many of the joins won't work in PowerBI. To give one example, I am not able to join two tables together where the joining columns are not unique, however this is not a problem in SQL. Is the only solution to do all my SQL coding on the back end to create a flat file that I can bring into BI to visualize, or is there something Power BI can do here?
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