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                ### 數據庫范式 1NF(第一范式):原子性,數據庫中的每一列都是不可分割的基本數據項 2NF(第二范式):唯一性,每個表必須有且僅有一個數據元素為主鍵(Primary key),其他屬性需完全依賴于主鍵 3NF(第三范式):獨立性,消除傳遞依賴,數據表中的每一列都和主鍵直接相關,而不能間接相關
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