The primary key table contains only one record that relates to none, one, or many records in the related table. This is the most commonly used type of relationship.
主键表的一个记录，关联到关联表中，存在，没有，或者有一个，或者多个记录。这是最重要的也是最常见的关系。
The primary key table contains only one record that relates to none, one, or many records in the related table. This is the most commonly used type of relationship.
主键表的一个记录，关联到关联表中，存在，没有，或者有一个，或者多个记录。这是最重要的也是最常见的关系。
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