Whether the E-R schema constructed caters for database requirement and how correctness and completeness of the conceptual schema is evaluated remains a problem needed for further research.
所构造出的E - R模式是否满足数据库的设计要求，如何评价所构造的概念模型的正确性与完整性，仍然是个需要深入研究的问题。
Whether the E-R schema constructed caters for database requirement and how correctness and completeness of the conceptual schema is evaluated remains a problem needed for further research.
所构造出的E - R模式是否满足数据库的设计要求，如何评价所构造的概念模型的正确性与完整性，仍然是个需要深入研究的问题。
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