Understanding the UPDATE Statement
When you update, you work with two SAS data sets. The
data set that contains the original information is the master data
set. The data set that contains the new information is the transaction
data set. Many applications, such as maintaining mailing lists and
inventories, call for periodic updates of information.
In a DATA step, the UPDATE statement reads observations from the transaction data set and updates corresponding observations (observations with the same value of all BY variables) from the master data set. All nonmissing values for variables in the transaction data set replace the corresponding values that are read from the master data set. SAS writes the modified observations to the data set that ...
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