Each entity in the logical data model is assigned a primary key.

逻辑数据模型中的每个实体都被指定了一个主键。

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Click the Employee entity, and select empno its primary key.

点击Employee实体，并选择empno作为它的主要关键字。

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An Entity class needs a primary key.

Entity类需要一个主键。

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The entity has a primary key.

实体具有主键。

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The entity has a primary key.

实体具有主键。

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