title: The ambiguous error occurs while using the models.sequelize.col () in the include in sequelize(node.js express)
body: <p>mariadb,</p>
  
  <pre><code>show tables;
  Board
  Comment
  </code></pre>
  
  <p>my code,</p>
  
  <pre><code>models.Board.findAll({
  attributes: [
    '_no', 'title', 'content', 'createdAt'
  ],
  include: [
    {
      model: models.Comment,
      tableAlias: 'Comment',
      attributes: [
        [models.sequelize.fn('count', models.sequelize.col('_no')), 'comment']
      ]
    }
  ],
  group: ['_no', 'title', 'content', 'createdAt'],
  order: [
    ['createdAt', 'DESC']
  ],
      raw: true
     }).then(function(boards)
  
       {
           res.send(JSON.stringify(boards));
  
        });
  </code></pre>
  
  <p>Why error occurs?</p>
  
  <pre><code>Unhandled rejection SequelizeDatabaseError: ER_NON_UNIQ_ERROR: Column '_no' in field list is ambiguous
  </code></pre>
  
  <p>models.sequelize.col('_no') -> models.sequelize.col('models.Comment._no')
  error, too.</p>
  
  <p>models.sequelize.col ( '_ no') in the _no want to use Comment table.</p>
  
  <p>thanks.</p>