Rather than altering the declared grain to be something unnatural such as one row per payment method per product on a POS transaction, you would likely capture the payment method in a separate fact table with a granularity of either one row per transaction (then the various payment method options would appear as separate facts) or one row per payment method per transaction (which would require a separate payment method dimension to associate with each row).
- Chapter 3: Retail Sales
- from The Data Warehouse Toolkit: The Definitive Guide to Dimensional Modeling, 3rd Edition
- Publisher: John Wiley & Sons
- Released: July 2013
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