In the example above, data set three is created by merging data sets one and two. The SAS codes below show how they can be sorted and merged: Suppose you create two data sets ( one and If you merge data sets without sorting, called one-to-one merging, the data of the merged file will overwrite the primary data set without considering whether or not two observations are the same. The file order is determined by the merge statement. This is done using the MERGE statement and BY statement. Note that the file order is not determined by the order in which the files are read by SAS. (SAS does not reset variables to missing if they were created by a SUM statement, or if the values came from a SAS data set via a SET or MERGE statement.). To merge two or more data sets in SAS, you must first sort both data sets by a shared variable upon which the merging will be based, and then use the MERGE statement in yourÄATA statement. Multiple SAS data sets can be merged based on a specific common variable to give a single data set.
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