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数据库理论

就像我们可能会认为电影特效是理所当然的,直到我们看到以前时代的技术水平一样,我们不能完全欣赏到关系数据库的威力,因为我们看不到它们之前的东西。

关系数据库允许任何一个表通过共同字段与任何其他表相关联。这是一个高度灵活的系统,大多数现代数据库都是关系型的。

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