I was recently hired into a new company as a Data Analyst for a BI group. The data warehouse that I was assigned to was created years ago and is a big kluge - a mishmash of tranforms, filters, and rules - mostly or all undocumented. In fact, it was so badly architected that the company eventually abandoned it and created a new dw, but they keep the old one running, and occasionally updated, for various reasons.
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