Which of the following statements about a data warehouse is NOT true?下列关于数据仓库的陈述中哪一项是不正确的?:()?
（A）A user should know where the data comes from用户应该知道数据来自哪里。
（B）Programs may have to be written to provide relationships between data in a data warehouse that are NOT obvious in the operational environment可能必须编写程序来提供数据仓库中数据之间的关系，而这些关系在操作环境中并不明显。
（C）Performance is more important in a data warehouse environment than in an operation al environment性能在数据仓库环境中比在操作环境中更重要
（D）Some data in a data warehouse may be derived rather than original data数据仓库中的某些数据可能是派生的，而不是原始数据
（E）No answer没有回答 答案解析:
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