console/migrations/m160202_084703_specialization.php

<?php

use yii\db\Migration;

class m160202_084703_specialization extends Migration
{
    public function up()
    {
        $tableOptions = null;

        $this->createTable('{{%specialization}}', [
            'specialization_id' => $this->primaryKey(),
            'specialization_pid' => $this->integer(),
            'specialization_name' => $this->string(255)->notNull()
        ], $tableOptions);

    }

    public function down()
    {
        $this->dropTable('{{%specialization}}');
    }
}