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Step-by-Step Programming with Base SAS 9.4 by SAS Institute

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Updating a Data Set

In this example, the circulation department of a magazine maintains a mailing list that contains tens of thousands of names. Each issue of the magazine contains a form for readers to fill out when they change their names or addresses. To simplify the maintenance job, the form requests that readers send only new information. New subscribers can start a subscription by completing the entire form. When a form is received, a data entry operator enters the information about the form into a raw data file. The mailing list is updated once per month from the raw data file.
The mailing list includes these variables for each subscriber:
SubscriberId
specifies a unique number that is assigned to the subscriber at the time the subscription ...

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