In cases where the data used to populate a target field is dependent on some condition, that condition can be applied to the mapping on that target field.
对于要依赖某种条件来使用数据填充目标字段的情况，可以对该目标字段上的映射应用条件。
Selecting any mapping statement in the Script Pane shows all source and target mappables referenced in the statement, such as mapping source, loop iterator, condition, where clause, and so on.
在Script窗格中选择任何映射语句，这将显示该语句中所引用的所有源和目标可映射对象，如映射源、循环迭代器、条件、where子句，等等。
In this paper, the generalized vector composite formulas are proved by the mapping method of complex function, and a necessary and sufficient condition that can be used easily is proved too.
本文用复变函数论的映射方法证明了一个普遍意义的矢量性物理量的合成公式，并证明了一个易于判定的充要条件。
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