The above example shows that sequential scan and indexes are used to do the data retrieval, and the nested-loop join method is used to join all tables.是什么意思_The above example shows that sequential scan and indexes are used to do the data retrieval, and the nested-loop join method is used to join all tables.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句