title: Unique values in Sequelize
body: <p>I use Sequelize ORM for Node.js. I need to get lines with unique values in certain column. Example table:</p>
  
  <pre><code>id | name | group
  -----------------
  1  | One  | 2
  2  | Two  | 1
  3  | Three| 2
  4  | Four | 3
  5  | Five | 1
  </code></pre>
  
  <p>Query for column <code>group</code> and result:</p>
  
  <pre><code>id | name | group
  -----------------
  1  | One  | 2
  2  | Two  | 1
  4  | Four | 3
  </code></pre>
  
  <p>Lines One, Two and Four was the first who had unique <code>group</code> values. How to make it in Sequelize?</p>