In that case, purchase order documents with a total price of $100 or more do not need to specify a shipping method because the standard shipping is free for those orders.
在该例中，购买订单文档若总价超过 $100则不需要指定配送方式，因为对于这种订单是免费配送的。
In Listing 5, you have a standard primary key column called PO_ID (that is, purchase order ID).
在清单5中，您有一个称为PO_ID的标准主键列(即订单id)。
In Listing 5, you have a standard primary key column called PO_ID (that is, purchase order ID).
在清单5中，您有一个称为PO_ID的标准主键列(即订单id)。
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