The owner of the data warehouse must decide how to respond to the changes in the descriptions of dimensional entities like employee, customer, product
In this example, supplier_code is the natural key and supplier_key is a surrogate key. technically, the surrogate key is not necessary, since the table
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The notion of time pervades every corner of the data warehouse. most of the fundamental measurements we store in our fact tables are time series, which we
Using t-sql merge to load slowly changing dimensions can be tricky. learn the fundamentals and pitfalls to avoid.