William wishes to thank Mike Cross (mcross@racenter.com), data warehouse director at Rent-A-Center, for his contributions to this month's column.

The one overriding constant about data warehousing is that the data warehouse will change. Data designs that you spend months perfecting will become obsolete overnight, and unforeseen business requirements will require a different view of the data. If you want to be a successful data warehouse architect, you can either become very astute at accommodating change or you can design for the unknown.

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