第一.二.三范式的定义与用途.我对1nf 2nf 3nf 了解的不够深刻,
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![第一.二.三范式的定义与用途.我对1nf 2nf 3nf 了解的不够深刻,](/uploads/image/z/6246873-9-3.jpg?t=%E7%AC%AC%E4%B8%80.%E4%BA%8C.%E4%B8%89%E8%8C%83%E5%BC%8F%E7%9A%84%E5%AE%9A%E4%B9%89%E4%B8%8E%E7%94%A8%E9%80%94.%E6%88%91%E5%AF%B91nf+2nf+3nf+%E4%BA%86%E8%A7%A3%E7%9A%84%E4%B8%8D%E5%A4%9F%E6%B7%B1%E5%88%BB%2C)
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