策略3：每个具体类一个表(estates)。

Strategy 3: One table per concrete class (Estates).

youdao

我们的第三个，也是最后一个策略可能是三个策略当中最有想象力的：每个具体类一个表，抽象超类estate没有表。

Our third and last strategy is probably the most imaginative of all: having one table per concrete class and none for the Estate abstract superclass.

youdao

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.

youdao

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.

youdao