問題文
A hotel group ingested guest rows from its reservation system, its loyalty program, and its spa booking tool. The same guest appears in all three. The sponsor asks what unification is supposed to achieve here. What is the accurate answer?
選択肢
- It links the rows that describe the same person across the three sources and produces one profile that represents that person.
- It renames fields to a common standard, so the three sources end up with one column layout and the guest's rows can be counted together in a report.
- It deletes the duplicate rows from the data lake so that a single row per guest remains, which is what allows a marketer to count guests without double counting them in a segment.
- It rewrites the three source systems so that they all store the same guest identifier going forward, which removes the duplication at its origin and makes further matching unnecessary in later loads.