Handling Missing Values
By default, if the transaction data set contains missing
values for a variable that is common to both the master and the transaction
data sets, then the MODIFY statement does not replace values in the
master data set with missing values.
If you want to replace
values in the master data set with missing values, then you use the
UPDATEMODE= option in the MODIFY statement. UPDATEMODE= specifies
whether missing values in a transaction data set replace existing
values in a master data set.
The syntax for using
the UPDATEMODE= option with the MODIFY statement follows:
MODIFY master-SAS-data-set transaction-SAS-data-set <UPDATEMODE=MISSINGCHECK
| NOMISSINGCHECK>;
BY by-variable;
MISSINGCHECK prevents missing values in ...
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