在建设数据库或数据仓库时,我们的目标越来越不明确。图为这世界瞬息万变,我们总是尽可能地搜集各种各样的信息,以备万一之用。可如何才能有效地从数据库的苍茫信息海洋中找到适合某特定目的的专门数据成份呢? 许多年来,很多公司在自己的数据矿山周围徘徊,期望着能挖掘出埋藏着的金矿。由于找不到适当的软件工具,并且必需的计算机价格太昂贵,金矿很难找。但是公司的经理们知道总有一天,它们的数据将被开采出来并带回丰厚的回报。 When building a database or data warehouse, our goals become less and less clear. The picture shows that the world is changing rapidly. We always collect as much information as possible to prepare for the event. How can we effectively find specific data components suitable for a specific purpose from the vast ocean of information in the database? For many years, many companies have been wandering around their own data mines, hoping to tap the buried gold deposits. The gold mine is hard to find because it cannot find proper software tools and the necessary computer prices are too expensive. But the company’s managers know that one day, their data will be mined and brought back with great returns.