Data _NULL_;
........
用于在数据步中执行操作,但不产生数据集。_NULL_ tells sas not to bother writing a sas data set,and makes the program run slightly faster.
Data _NULL_;
........
用于在数据步中执行操作,但不产生数据集。_NULL_ tells sas not to bother writing a sas data set,and makes the program run slightly faster.
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