A relation is defined graphically without writing code and it can serve many purposes in an application.
一个关系通过图形方式定义，无需编写代码；它可以满足一个应用程序中的多个目的。
A relation is defined between two tables by specifying key columns that link the tables, most commonly regular relations such as customer-to-orders.
两个表之间的关系通过指定链接表的键列来定义，最常见的常规关系比如“客户-订单”。
A relation is defined between two tables by specifying key columns that link the tables, most commonly regular relations such as customer-to-orders.
两个表之间的关系通过指定链接表的键列来定义，最常见的常规关系比如“客户-订单”。
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