title: Why is "Yes" a value of -1 in MS Access database?
body: <p>I'm looking at linked data in MS Access.</p>
  
  <p>The "Yes/No" fields contain the value -1 for YES and 0 for NO. Can someone explain why such a counter-intuitive value is used for "Yes"? (Obviously, it should be 1 and 0)</p>
  
  <p>I imagine there must be a good reason, and I would like to know it.</p>