So, in the case of the book table, there is a primary key field called book_id.

所以，在book表这个示例中，有一个主键字段叫做book_id。

youdao

So, in the case of the book table, there is a primary key field called book_id.

所以，在book表这个示例中，有一个主键字段叫做book_id。

youdao