【单选题】
在关系数据库设计中，设计关系模式是数据库设计中的 阶段的任务 ___
A. 物理设计
B. 概念设计
C. 逻辑设计
D. 需求分析
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把实体-联系模型转换为关系模型时，实体之间一对多联系在关系模型中是通过 来实现 ___
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数据库设计可分为 6 个阶段，每个阶段都有自己的设计内容，“为哪些关系，在哪些属性上、建什么样的索引”这一设计内容应该属于 设计阶段 ___
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把实体-联系模型转换为关系模型时，实体之间一对一联系在关系模型中是通过 来实现 ___
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下面的选项中，不是关系数据库基本特征的是 ___
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