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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;