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DATASETS procedure
When you update a data
set, you create a new data set containing the updated information.
Typically, you want to use PROC DATASETS to delete the old master
data set and rename the new one so that you can use the same program
the next time you update the information. For more information,
see Understanding the DATASETS Procedure.
Indexes
If a data set has an
index on the variable or variables named in the BY statement that
accompanies the UPDATE statement, you do not need to sort that data
set. For more
information, see “Understanding SAS Indexes” in Chapter 26 of SAS Language Reference: Concepts.
MERGE statement
For more information,
see Merging SAS Data Sets.
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