title: How do I DROP a constraint from a sqlite (3.6.21) table?
body: <p>I have the following table:</p>
  
  <pre><code>CREATE TABLE child( 
    id INTEGER PRIMARY KEY, 
    parent_id INTEGER CONSTRAINT parent_id REFERENCES parent(id), 
    description TEXT);
  </code></pre>
  
  <p>How do I drop the constraint?</p>