Understand how to create an entity supertype, subtypes, and associated services to allow the processing of each.

了解如何创建实体超类型、子类型和相关服务。

youdao

Normalization decisions are finalized in the logical data model resulting in the final normalized representation of entity-to-entity relationships as well as supertype-to-subtype hierarchies.

规范化决定在逻辑数据模型中得以完成，并导致实体-实体关系与超类型-子类型层次关系的最终规范化表示。

youdao