Methods of Combining SAS Data Sets

Definition of Modifying

Modifying a SAS data set replaces, deletes, or appends observations in an existing data set. Modifying a SAS data set is similar to updating a SAS data set, but the following differences exist:

Modifying cannot create a new data set, while updating can.
Unlike updating, modifying does not require that the master data set or the transaction data set be sorted.

You change an existing file by using the MODIFY statement along with a BY statement. The following figure shows the results.

Modifying a Data Set

[Modifying a Data Set]

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