【多选题】【消耗次数：1】
要建立一个数据库，需要经过（）设计阶段。
①
概念设计
②
库结构设计
③
模块设计
④
物理设计
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【简答题】
数据库设计的步骤主要有需求分析、概念结构设计、[填空1]、物理结构设计 、数据库实施、数据库运行与维护6大步骤。
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