TO create a new table columnusing magento installer, you can use this method :
$installer = $this; $connection = $installer->getConnection(); $installer->startSetup(); if ($connection->tableColumnExists($this->getTable('adin/slider'), 'image_mobile') === false) { $installer->run("ALTER TABLE `{$installer->getTable('adin/slider')}` ADD COLUMN `image_mobile` VARCHAR(255) NOT NULL DEFAULT '' ;"); } $installer->endSetup();