Souke/console/migrations/m161219_144530_champs_facture_ca.php

<?php

use yii\db\Migration;
use yii\db\Schema;

class m161219_144530_champs_facture_ca extends Migration
{
    public function up()
    {
        $this->addColumn('facture', 'ca', Schema::TYPE_FLOAT) ;
    }

    public function down()
    {
        $this->dropColumn('facture', 'ca') ;
    }
}