SAS Certification Prep Guide, 4th Edition

Summary

Text Summary

Using the MODIFY Statement

When you use the MODIFY statement to modify a SAS data set, SAS does not create a second copy of the data as it does when you use the SET, MERGE, or UPDATE statements. The descriptor portion of the SAS data set stays the same. Updated observations are written back to the same location as the original observation.

Modifying All Observations in a SAS Data Set

You can use the MODIFY statement with an assignment statement to modify all the observations in a SAS data set.

Modifying Observations Using a Transaction Data Set

To modify a master data set using a transaction data set, you use the MODIFY statement with a BY statement to specify the matching variable or variables. When you use the MODIFY ...