title: How do you count the number of Opportunities associated with a Contact?
body: <p>I am unable to figure out how to create a roll-up field which will count active Opportunities on a Contact. It is easy to get a count at the Account level, however that's for all Opportunities associated with an Account, which may or may not be related to the specific Contact I'm looking at. </p>
  
  <p>Is there a way to query the Contact / Opportunity relationship and return a count? </p>