title: Map two different entities to the same table?
body: <p>I have a table in my database with a lot of fields.  <em>Most of the time I need all those fields</em>.  There is one scenario, however, where I only need a few of the fields, and I am loading a ton of rows.</p>
  
  <p>What I'd like to do is add in an Entity manually, and then simply map it to the original table, but delete the columns I don't need. I set this all up, but I get the rather self-explanatory error of:</p>
  
  <blockquote>
    <p>Problem in mapping fragments
    ...EntitySets 'FmvHistoryTrimmed' and
    'FMVHistories' are both mapped to
    table 'FMVHistory'. Their primary keys
    may collide.</p>
  </blockquote>
  
  <p>Is there some other way I should go about this?  Again, most of the time all of the columns are used, so I don't want to trim down the original entity and put the "extra" fields into a complex type.</p>