CASE WHEN "%HIV1%" = "Non-Reactive" 
       and "%HIV2%" <> "Reactive" 
       and "%HIV3%" <> "Reactive" then "Negative" 
     WHEN "%HIV1%" = "Reactive" 
       and "%HIV2%" <> "Non-Reactive" 
       and "%HIV3%" <> "Non-Reactive" then "Positive" 
	else CASE WHEN "%HIV2%" = "Reactive" and "%HIV3%" = "Reactive" then "Positive" 
		else "Inconclusive" 
		end 
end
/*
https://codebeautify.org/sqlformatter/y23e67982
*\