title: Zend_Auth_Adapter_DbTable for two tables?
body: <p>Usually, you keep username and password fields in one table (for example Users). In this case it is easy to use <code>Zend_Auth_Adapter_DbTable</code>. However, what if I have password in a separate Passwords table. How do you uses Zend_Auth_Adapter_DbTable to have <em>identityColumn</em> in a one table (Users) and <em>credentialColumn</em> in other table (Passwords)?</p>
  
  <p>Thanks.</p>