Duplicate entry '1' for key 'PRIMARY' in data migration in Magento

magento_sql_duplciate_store.sql

SET FOREIGN_KEY_CHECKS=0;
DROP TABLE IF EXISTS `core_store`;

CREATE TABLE `core_store` (
  `store_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Store Id',
  `code` varchar(32) DEFAULT NULL COMMENT 'Code',
  `website_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Website Id',
  `group_id` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Group Id',
  `name` varchar(255) NOT NULL COMMENT 'Store Name',
  `sort_order` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Store Sort Order',
  `is_active` smallint(5) unsigned NOT NULL DEFAULT '0' COMMENT 'Store Activity',
  PRIMARY KEY (`store_id`),
  UNIQUE KEY `UNQ_CORE_STORE_CODE` (`code`),
  KEY `IDX_CORE_STORE_WEBSITE_ID` (`website_id`),
  KEY `IDX_CORE_STORE_IS_ACTIVE_SORT_ORDER` (`is_active`,`sort_order`),
  KEY `IDX_CORE_STORE_GROUP_ID` (`group_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Stores';

LOCK TABLES `core_store` WRITE;
/*!40000 ALTER TABLE `core_store` DISABLE KEYS */;

INSERT INTO `core_store` (`store_id`, `code`, `website_id`, `group_id`, `name`, `sort_order`, `is_active`)
VALUES
(1,'admin',0,0,'Admin',0,1),
(2,'store',1,1,'Store',0,1);

UPDATE `core_store` SET `store_id` = '0' WHERE `store_id` = '1' COLLATE utf8_bin LIMIT 1;

UPDATE `core_store` SET `store_id` = '1' WHERE `store_id` = '2' COLLATE utf8_bin LIMIT 1;

/*!40000 ALTER TABLE `core_store` ENABLE KEYS */;
UNLOCK TABLES;