Invoking BY-Group Processing

You can invoke BY-group processing in both DATA steps and PROC steps by using a BY statement. For example, the following DATA step program uses the SET statement to combine observations from three SAS data sets by interleaving the files. The BY statement shows how the data is ordered.

data all_sales;    
   set region1 region2 region3;    
   by State City Zip;    
   ... more SAS statements ... 
run;

This section describes BY-group processing for the DATA step. For information on BY-group processing with procedures, see the SAS Procedures Guide.

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