A tutorial on identifying and extracting descriptive columns from fact tables in Power BI using dimensional modeling best practices. Covers how to create a proper payment dimension from related columns (payment method, card network, card type) and how to handle unrelated flag columns using a junk dimension. Step-by-step walkthrough in Power Query includes duplicating the fact table, removing duplicates, adding an index as a surrogate key, merging back to get the ID, and cleaning up the fact table to achieve a clean star schema.
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