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Conditional split also provides a default output in the case that the incoming row does not match any of the defined conditions, the row goes to the default output. This default output is normally used to move erroneous rows to a separate table.
Splitting a Dataset. Sometimes you may want to split a dataset into two or more datasets based on the value(s) of a variable(s). In this kind of data step, you create two or more datasets at one time based on one whole dataset. This method uses conditional logic with the THEN OUTPUT keywords. It is an extension of the method described above for subsetting data.