It's been 20 years since the term "data warehousing" was first coined. Since then, it has evolved into a mainstream activity for Fortune 1000 companies, with many undertaking one or more data warehousing projects over the last decade. However, even after 20 years in the marketplace, it is evident that data warehousing is still misunderstood.

The goal of data warehousing is to create "one version of the truth." However, in these attempts, many companies often create a proliferation of data silos instead. Here are some classic examples:

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