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| Methods of Combining SAS Data Sets |
Definition of Updating
Updating a SAS data set replaces the values of variables in one data set (the master data set) with values from another data set (the transaction data set). If the UPDATEMODE= option in the UPDATE statement is set to MISSINGCHECK, then missing values in a transaction data set do not replace existing values in a master data set. If the UPDATEMODE= option is set to NOMISSINGCHECK, then missing values in a transaction data set replace existing values in a master data set. The default setting is MISSINGCHECK.
You update a data set by using the UPDATE statement along with a BY statement. Both of the input data sets must be sorted by the variable that you use in the BY statement. The following figure shows the results of updating a SAS data set.
Updating a Master Data Set
![[Updating a Master Data Set]](images/fig11-9.gif)
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Copyright © 2012 by SAS Institute Inc., Cary, NC, USA. All rights reserved.