title: Can non-additive facts be part of transactional fact table
body: <p>I know there are three types of facts, and I've read that Transactional-Fact tables have fully additive facts which are the most useful type, but can non-additive facts be there as well? Or even semi-additive facts for that matter.</p>
  
  <p>I'm asking this because my teacher had this in one of her presentations:</p>
  
  <p>"While non-additive facts are not stored in fact tables, it is important not to
  lose track of them. For many processes, ratios are critical
  measurements without which a solution would leave much to
  be desired. <strong>Non-additive facts should be documented as
  part of the schema design.</strong>"</p>
  
  <p>If they can't be stored in there, how can they be documented as part of the schema design?</p>