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【多选题】
一般来说，数据库的设计过程要经历3个大的阶段，即可行性分析与研究阶段、系统设计阶段、设计实施阶段与系统运行阶段。在数据库的系统设计阶段主要完成哪些设计?( )
A.
概念设计
B.
逻辑结构设计
C.
物理结构设计
D.
系统结构设计
E.
定义设计
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