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。
My book is in the desk. my pen and pencil in the pencil case my photo is under the table .
这是我的房间我的书在书桌里面。我的钢笔和铅笔在笔盒里。
My book is in the desk. my pen and pencil in the pencil case my photo is under the table .
这是我的房间我的书在书桌里面。我的钢笔和铅笔在笔盒里。
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