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i download magento-220.127.116.11 files form http://www.magentocommerce.com/ and Overwrite all files of magento 18.104.22.168, when i access frontend, it is show new version is 1.51.0,the admin page also show 22.214.171.124, when i login to phpMyAdmin, i found the database only have 316 tables, if i install a new mageto 126.96.36.199,the tables quantity is 326, can you tell me how to upgrade database?