- data missing_01;
- set missing;
- by id;
- if first.id then id1=0;
- id1+1;
- run;
- data complete_01;
- set
- complete_a
- complete_b
- complete_c
- ;
- by id;
- if first.id then id1=0;
- id1+1;
- run;
- data r;
- update missing_01 complete_01;
- by id id1;
- drop id1;
- run;


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