Inheritance: Annotations — Single table, joined table, and table per class.
继承：标注——单个表、联合表和按类表。
With this approach you create one table per class, the attributes of which are the OID and the attributes that are specific to that class.
使用这种方法，为每个类创建一张表，它的属性是OID和特定于该类的属性。
Mixing strategies such as "Table per Subclass" embedded in "Table per class Hierarchy" so that you can take advantages of different strategies.
采用混合策略，例如“每个类层次一张表”中嵌入“每个子类一张表”，这样可以利用不同策略的优势。
Table per-class: (Optional) Each concrete subclass is mapped to a table and contains columns for super class attributes.
按类表：(可选)每个具体的子类映射到一个表，并且包含超类属性的列。
Table per-class: (Optional) Each concrete subclass is mapped to a table and contains columns for super class attributes.
按类表：(可选)每个具体的子类映射到一个表，并且包含超类属性的列。
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