I need to make it so if sm.mediaCode is 0 then stm.mediaCode will have a value like 'personal'. Im not allowed to use Case

Question

select camp.campaignCode,CampaignName, beginDate, endDate, leadingCampCode,
isnull(sm.mediaCode,0) \'Social Media\', isNull(stm.mediaCode,0) as \'Personal\'
from [db