title: Get all the rows that have unique values in a field, using sequelize
body: <p>What options should I pass to <code>findAndCountAll</code> method of a sequelize model so that it returns the rows that have unique values in a certain field? In my particular case I need to get all the models that have unique <code>attack_id</code> field values. </p>
  
  <p><code>const { count, rows } = await myModel.findAndCountAll(?????);</code></p>