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Rick Aster: Professional SAS Programming Shortcuts: Contents

Chapter 23
Program
Creating integrity constraints

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proc datasets library=corp nolist;
modify newhire; 
   ic create born=check(where=(dob < date()))
       message='Birth date must be before today.';
   ic create est_hire=check(where=(hiredate >= '01jan1989'd))
       message='Hire date is missing or is too early.';
quit;