12-15-2011 04:03 PM
What is the best approach to update a data set that only adds the new data, change in case of revisions but does not create a duplicate variables?
data merge, proc sql?
Thanks for your advice
12-15-2011 09:04 PM
If you want to replace existing rows then use MERGE. Make sure to have the new dataset listed last.
data want ;
merge old new ;
by id ;
You could also look at the UPDATE statement, but that is really intended for transactions, not new records. Read about what happens when the transaction dataset has missing values for a variable.
For more complicated situations look at the MODIFY statement.