Processes | Expression Parameters | Key Variables for Merging

Key Variables for Merging
Use this field to specify the variables by which to merge the files.
These variables must be present in all of the tall data sets selected for merging.
If this field is left blank , all of the rows are merged directly with no sorting or matching of variables.
To Specify One or More Key Merge Variables:
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All of the variables in the specified input data set are displayed in the Available Variables field.
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Click to add the highlighted variable(s) to the Key Variables for Merging field, as shown below: