yii2 migration里使用Query的例子

　　

use yiidbMigration;

class m170119_031753_add_list_id_index_on_user_list_table extends Migration
{
    public function up()
    {
        $projectIds = (new yiidbQuery())
            ->select(['project_name'])
            ->from('duplicate_option')
            ->column();
            
            // ......