app/code/core/Mage/Sales/sql/sales_setup/mysql4-upgrade-0.8.8-0.8.9.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Sales
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
$installer = $this;
/* @var $installer Mage_Sales_Model_Entity_Setup */

$installer->startSetup();
$installer->run("
    ALTER TABLE {$this->getTable('sales_order_entity')} MODIFY COLUMN `store_id` SMALLINT(5) UNSIGNED;
");

$installer->getConnection()->dropForeignKey($this->getTable('sales_order_entity'), 'FK_sales_order_entity_store');
$installer->getConnection()->dropColumn($this->getTable('sales_order_entity_datetime'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_order_entity_decimal'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_order_entity_int'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_order_entity_text'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_order_entity_varchar'), 'store_id');

$installer->getConnection()->dropColumn($this->getTable('sales_quote_entity_datetime'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_entity_decimal'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_entity_int'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_entity_text'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_entity_varchar'), 'store_id');

$installer->getConnection()->dropColumn($this->getTable('sales_quote_temp_datetime'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_temp_decimal'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_temp_int'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_temp_text'), 'store_id');
$installer->getConnection()->dropColumn($this->getTable('sales_quote_temp_varchar'), 'store_id');

$installer->run("
ALTER TABLE {$this->getTable('sales_order_entity')}
    ADD CONSTRAINT `FK_SALE_ORDER_ENTITY_STORE` FOREIGN KEY `FK_SALE_ORDER_ENTITY_STORE` (`store_id`)
    REFERENCES {$this->getTable('core_store')} (`store_id`)
    ON DELETE SET NULL
    ON UPDATE CASCADE;
");
$installer->installEntities();
$installer->endSetup();

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