console/migrations/m160425_121151_add_achievement_to_job.php

<?php

use yii\db\Migration;

/**
 * Handles adding achievement to table `job`.
 */
class m160425_121151_add_achievement_to_job extends Migration
{
    /**
     * @inheritdoc
     */
    public function up()
    {
        $this->addColumn('job', 'achievement', $this->string());
    }

    /**
     * @inheritdoc
     */
    public function down()
    {
        $this->dropColumn('job', 'achievement');
    }
}