E-R图转换成关系模式

整理转载自：dom http://www.javashuo.com/article/p-zihkjgmr-mo.html.net https://blog.csdn.net/u013036685/article/details/492316573d https://blog.csdn.net/tang_huan_11/article/details/12974857blog 一.概念 E-R(En

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