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索引是什么

索引定義:是指是一種單獨的、物理的對數據庫表中一列或多列的值進行排序
的一種存儲結構。
索引作用:相當于圖書的目錄,可以根據圖書目錄快速找到想要找的內容。
搜索引擎中的索引,也是為了快速找到用戶想要的內容。

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