data have;
input student $ time $ flag;
datalines;
A 1:20 0
A 1:35. 1
A 2:40 0
B 5:30. 0
B 5:35. 0
B 6:10. 1
;
data want;
merge have
have(firstobs = 2 keep = flag rename = flag = f);
if f or flag;
drop f;
run;
data have;
input student $ time $ flag;
datalines;
A 1:20 0
A 1:35. 1
A 2:40 0
B 5:30. 0
B 5:35. 0
B 6:10. 1
;
data want;
merge have
have(firstobs = 2 keep = flag rename = flag = f);
if f or flag;
drop f;
run;
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