<?php use yii\db\Migration; use yii\db\mysql\Schema; class m190305_104710_producer_siret_non_requis extends Migration { public function up() { $this->alterColumn('producer', 'siret', Schema::TYPE_STRING.' DEFAULT NULL') ; } public function down() { $this->alterColumn('producer', 'siret', Schema::TYPE_STRING.' NOT NULL') ; } }