Hi, HJKM
data table;
cola='x';
col_date='01Jan1990'd;
colb='blue';
run;
data table1;
set work.table;
where ColA="x" and
((Col_date >= '01Jan1990'd and ColB = "yellow") or
(Col_date >= '01Jan1990'd and ColB = "blue")) ;
format col_date ddmmyy10.;
proc print;
run;
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