as you learned earlier
正如你之前学到的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
As you learned earlier in the book, this form of inheritance is supported through the use of a discriminator column in your database as well as the UI, as seen in Figure 12-2.
在图12 - 2，在之前本书中学习到的这个界面支持在你的数据库使用列识别器来设计继承。
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