Parameters | Expression Parameters | Variables by Which to Merge Secondary Annotation Data

Variables by Which to Merge Secondary Annotation Data
Use this field to specify variables that are to be used to merge the results of this process with the second Annotation SAS Data Set specified on the Annotation tab. The values of these variables create a matching key used to perform the join. They are often the same as one or more of the By Variables specified previously.
If left blank, these are assumed to be the same as the Annotation Merge Variables.
To Specify One or More Variables by Which to Merge Annotation Data:
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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 Variables by Which to Merge Secondary Annotation Data field, as shown below: