了解创建子类型实体和使用它们的三种服务(添加、更新和按标识符查询)的步骤，同时考虑性能因素。
Step through the creation of subtyped entities and three service types that may consume them (add, update, and inquiry by identifier) with performance considerations in mind.
了解MasterInformationHub实体和服务的结构，以及如何定制子类型实体及其服务的实现。
Gain insight into the structure of Master Information Hub entities and services, and the possibilities you have to customize the implementation of a subtyped entity and its services.
了解如何创建实体超类型、子类型和相关服务。
Understand how to create an entity supertype, subtypes, and associated services to allow the processing of each.
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。
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。
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.
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