The second step is to select those many-to-many relationships in the ER model containing numeric and additive nonkey facts and to designate them as fact tables. The third step is to denormalize all of the remaining tables into flat tables with single-part keys that connect directly to the fact tables. These tables become the dimension tables. In cases where a dimension table connects to more than one fact table, we represent this same dimension table in both schemas, and we refer to the dimension tables as “conformed” between the two dimensional models.
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