title: knex.js, would like to translate "and" condition in left join
body: <p>I have below query, I would like to represent this query in knex fromat. I have made it work by usng <code>raw</code> function but i am curious if it is possible with knex style.</p>
  
  <pre><code>SELECT t.id, t.title, s.userId
  FROM title t LEFT JOIN
       subscribe s ON t.id  = s.titleId AND s.userId = 1;
  </code></pre>