The Output Expected is
expalning the scenario:if you examine for personId = 2 the output would be
since the condition is if code =1 eliminate it from result set. so we are left with the other record which dont have any other record within 48 hours of it start date and code !=1. So that record should not be in the output result.
Well how about taking the [answer @ThomasRushton gave you on your other question] and adding the filter on the new column