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.
派生的空间列location使用原始的坐标：经度作为X，纬度作为Y。
The derived spatial column, Location, USES the original coordinates: longitude as X, latitude as Y.
定义输出结果集，使之包括一个integer类型的id列，它由XQuery表达式中指定的节点派生而来。
Define the output result set to include an ID column of type integer that is derived from the node specified in the XQuery expression.
可针对单个列、单个列的派生值、多个列和多个列的派生值创建索引。
An index can be created on a single column, on derived values of a single column, or on a combination of columns and derived values of columns.
使用环境参数作为到一个散列的键，从而派生出theme值。
Derive the Theme value by using the environment parameter as a key to a hash.
HASH_LOOKUP，该函数根据源列派生的值来确定查找表的目标列值。
HASH_LOOKUP, a function that determines the destination column value from a lookup table according to a value derived from a source column.
这使报表工具能够利用包含在逻辑数据模型中的所有派生方法，任何其他列也都一样。
This enables reporting tools to leverage all the derived measures contained in the logical data model the same as any other column.
在单表继承中，一个数据库表同时包含基类和派生类的列。
In single-table inheritance, there is a single database table that contains columns for both base and derived classes.
在单表继承中，一个数据库表同时包含基类和派生类的列。
In single-table inheritance, there is a single database table that contains columns for both base and derived classes.
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