Each entity must have a unique entity key within an entity set.
实体集内的每个实体必须要有一个唯一的实体索引键。
The entity key for the instance is unique within the entity set.
实例的实体键在该实体集中是唯一的。
The properties that make up an entity key are chosen at design time.
构成实体键的属性是在设计时选择的。
The properties that make up an entity key for a given entity type cannot change.
构成给定实体类型的实体键的属性不可更改。
The properties that make up an entity key for a given entity type cannot change.
构成给定实体类型的实体键的属性不可更改。
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