派生列转换使用通过表达式所创建的值来填充数据流中的新列或更新现有列。
The Derived column transformation USES values created by using expressions either to populate new columns in a data flow, or to update existing columns.
ACCTPROFILE表i d列的值是从输入文件的第一个字段派生出来的。
Values for the ID column of the ACCTPROFILE table are derived from the first field in the input file.
任意键是一列，通常比操作派生的键要小。
An arbitrary key is one column and is almost always smaller than an operationally derived key.
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