这种转换只适用于单一源列和单一目的列。
This transformation only works with a single source column and a single destination column.
有别于单一目的的data marts 数据仓库支持更深层次的分析。
Unlike single-subject data marts, a data warehouse encourages deeper levels of analysis.
此为，对任何确信心智具有单一目的性的人来说，没有任何东西会比这些基于方法和目标的特征更加无用的了。
Moreover, to anyone who is convinced of the mind's singleness of purpose, nothing is more futile than these distinctions based on methods and objects.
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