title: sql could not drop constraint when there is no constraint
body: <p>I want to alter my table and drop a column which i know there is no data in it(because I just created it) now I want to delete it and it says   </p>
  
  <blockquote>
    <p>"SQL Error (3727): Could not drop constraint. See previous errors."  </p>
  </blockquote>
  
  <p>I use the following code:  </p>
  
  <pre><code>    ALTER TABLE Object DROP WAddress</code></pre>