title: Multi-WHERE for two fields in different MySQL tables for a SELECT query
body: <p>I'm trying to get results back if two cases match:</p>
  
  <ul>
  <li>table_users.Email='user@email.com'</li>
  <li>table_devices.DeviceUuid='51ec969c-8546-41f4-a748-ec2458c81d17'</li>
  </ul>
  
  <p>But, I get empty results even though table_users.Email='user@email.com' exists!!!</p>
  
  <pre><code>SELECT table_users.Email, table_users.DeleteFlag, table_devices.DeviceUuid 
  FROM table_users, table_devices 
  WHERE table_users.Email='user@email.com' 
    OR table_devices.DeviceUuid='51ec969c-8546-41f4-a748-ec2458c81d17';
  </code></pre>
  
  <p>What am I missing...?  I'd rather not break this into two queries for performance reasons.</p>
  
  <p>Thanks!</p>