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Rick Aster: Professional SAS Programming Shortcuts: Contents

Chapter 51
Program
Merge after checking for unique key values

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DATA A1 / VIEW=A1;
   SET A;
   BY X;
   IF LAST.X;
RUN;
DATA B1 / VIEW=B1;
   SET B;
   BY X;
   IF LAST.X;
RUN;
DATA D;
   MERGE A1 B1 C;
   BY X;
RUN;