app/code/core/Mage/Catalog/sql/catalog_setup/mysql4-upgrade-0.7.60-0.7.61.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_Catalog
 * @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_Catalog_Model_Resource_Eav_Mysql4_Setup */

$tableCatalogProduct = $this->getTable('catalog/product');

$types = array('datetime', 'decimal', 'int', 'text', 'varchar');

foreach ($types as $type) {
    $tableName = $tableCatalogProduct . '_' . $type;

    $select = $installer->getConnection()->select()
        ->from($tableName, array(
            'entity_id'         => 'entity_id',
            'attribute_id'      => 'attribute_id',
            'store_id'          => 'store_id',
            'rows_count'        => 'COUNT(*)'))
        ->group(array('entity_id', 'attribute_id', 'store_id'))
        ->having('rows_count > 1');
    $query = $installer->getConnection()->query($select);

    while ($row = $query->fetch()) {
        $sql = 'DELETE FROM `' . $tableName . '`'
            . ' WHERE entity_id=? AND attribute_id=? AND store_id=?'
            . ' LIMIT ' . ($row['rows_count'] - 1);
        $installer->getConnection()->query($sql, array(
            $row['entity_id'],
            $row['attribute_id'],
            $row['store_id']
        ));
    }

    $installer->getConnection()->addKey($tableName, 'IDX_ATTRIBUTE_VALUE', array('entity_id', 'attribute_id', 'store_id'), 'unique');
}

// exception for gallery table

$tableName = $tableCatalogProduct . '_gallery';

$select = $installer->getConnection()->select()
    ->from($tableName, array(
        'entity_type_id'    => 'entity_type_id',
        'entity_id'         => 'entity_id',
        'attribute_id'      => 'attribute_id',
        'store_id'          => 'store_id',
        'rows_count'        => 'COUNT(*)'))
    ->group(array('entity_id', 'attribute_id', 'store_id'))
    ->having('rows_count > 1');
$query = $installer->getConnection()->query($select);

while ($row = $query->fetch()) {
    $sql = 'DELETE FROM `' . $tableName . '`'
        . ' WHERE entity_type_id=? AND entity_id=? AND attribute_id=? AND store_id=?'
        . ' LIMIT ' . ($row['rows_count'] - 1);
    $installer->getConnection()->query($sql, array(
        $row['entity_type_id'],
        $row['entity_id'],
        $row['attribute_id'],
        $row['store_id']
    ));
}

$installer->getConnection()->addKey("{$tableCatalogProduct}_gallery", 'IDX_BASE', array('entity_type_id','entity_id','attribute_id','store_id'), 'unique');

---