title: How to concat columns in Sequelize with SQLite database
body: <p>I'm using Sequelize for a express project I'm working on.<br>
  In one query I want to retrieve a concatenated result of two columns.</p>
  
  <p>Like:</p>
  
  <pre><code>SELECT first_name || ' ' || last_name AS full_name FROM table
  </code></pre>
  
  <p>I tried the following syntax and got an error</p>
  
  <pre><code>router.get('/persons', function(req, res, next) {
    models.Person.findAll({
      attributes: [models.sequelize.fn('CONCAT', 'first_name', 'last_name')]
    })
      .then(function(persons) {
        res.send(persons);
      });
  });
  </code></pre>
  
  <p>The error message:</p>
  
  <pre><code>SELECT CONCAT('first_name', 'last_name') FROM `Persons` AS `Person`;
  Possibly unhandled SequelizeDatabaseError: Error: SQLITE_ERROR: no such function: CONCAT
  </code></pre>