To Foreign key column的意思|示意

The to-many> tag's column attribute specifies the foreign key column in the link table that relates the link table to the mapping table for the target class.

The column pdb_id is the foreign key that links atom coordinates to the corresponding PDBML document in the PDBXML table.

列pdb_id是一个外键，链接了原子坐标与pdbxml表中对应的PDBML文档。

You'd need to create a new table and also add a new column representing the foreign key to each article to point to a blog.

需要创建一个新表，还要添加指向blog的每个文章的外键。

One column links to the form (the row in the table) using a foreign key.

一列使用一个外键链接到表单上(表中的一行)。

The name attribute defines the foreign key on the table to which the Customer class is mapped, and the referenced column defines the primary key to which the table CustomerOrder is mapped.

名称属性在customer类映射到的表上定义外键，参考列定义Table CustomerOrder映射到的主键。

In addition to the id primary key, you've declared the customer_id column to be a foreign key referencing the customer table.

除了id主键以外，还声明了customer_id列作为引用客户表的外键。