<?php

use yii\db\Migration;

class m170629_114458_linkEntity extends Migration
{
    public function up()
    {
        $this->addColumn('{{%entity}}', 'linkId', $this->integer(11));
        $this->execute('UPDATE entity SET linkId = id WHERE id < 300');
    }

    public function down()
    {
        $this->dropColumn('{{%entity}}', 'linkId');
    }
}