However, each row must have a unique primary key, which is a sort of name for that particular bundle of data.

不过，每一行的主键(一种用于特定一组数据的名称)必须是唯一的。

youdao

However, each row must have a unique primary key, which is a sort of name for that particular bundle of data.

不过，每一行的主键(一种用于特定一组数据的名称)必须是唯一的。

youdao