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【单选题】
下列关于规范化理论的叙述中，哪些是正确的?( ) Ⅰ. 规范化理论研究关系模式中各属性之间的依赖关系及其对关系模式性能的影响 Ⅱ. 规范化理论给我们提供判断关系模式优劣的理论标准 Ⅲ. 规范化理论对于关系数据库设计具有重要指导意义 Ⅳ. 规范化理论最主要的应用是在数据库逻辑结构设计阶段 Ⅴ. 存数据库设计中有时候会适当地降低规范化程度而追求高查询性能 A) 仅Ⅰ、Ⅱ和Ⅲ B) 仅Ⅱ、Ⅲ和Ⅳ C) 仅Ⅲ、Ⅳ和Ⅴ D) 都正确A.
B.
C.
D.
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