The owner of the data warehouse must decide how to respond to the changes in the descriptions of dimensional entities like Employee, Customer, Product, Supplier, Location and others. In 30 years of studying this issue, I have found that only three different kinds of responses are needed. I call these slowly changing dimension (SCD) Types 1, 2 and 3. In last month’s column, I described Type 1, which overwrites the changed information in the dimension. In this column I describe Types 2 and 3.

Type 2: Add a New Dimension Record

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