Good day everyone,
I'm building a basic star schema for retail sales from POS, I have a doubt about the promotions handling. I sampled the source data and for about 10 million row sales there are only about 300 rows that has a promotion id.
Initially I added promotionid field on the sales fact table and a promotion dimension table. Now after previewing the data I think if would be a better approach to create a another fact table for promotions only and also joined with the rest of the dimension tables.
Thanks in advance.
