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)。
A join is performed inside the XQuery to show the name of each product, since the purchase order only stores product id, price, and quantity.
在XQuery内执行联接以显示每个产品的名称，因为采购订单仅存储产品ID、价格和数量。
We could have also used the customer id as a group id to find associations according to the whole customer purchase history.
我们也可以使用顾客id作为组的id来根据顾客购物的完整历史寻找关联。
You can instantiate it in any XML pattern you like — perhaps a PO element with an id attribute, or a purchase-order element with an ident sub-element.
可以用任何xml范式来实例化它，比如使用带有id属性的po元素，或者包含子元素ident的purchase - order元素。
Rigid requirements are the leading force in the boom realty market, and many buyers want to purchase the marriage room or get a Hangzhou ID card by buying Hangzhou realty.
刚性需求是今年这波二手房成交热潮中的主导力量，其中购置婚房、购房落户占购房者多数。
Under the scheme, a consumer would apply for a loan at a POS terminal or online to finance a purchase, get approved, receive an instantly generated loan ID, and use it to conclude the transaction.
在这个系统中，消费者需在线或使用POS终端申请消费，获得批准后，获得即时生成的贷款ID，并使用它来完成交易。
Under the scheme, a consumer would apply for a loan at a POS terminal or online to finance a purchase, get approved, receive an instantly generated loan ID, and use it to conclude the transaction.
在这个系统中，消费者需在线或使用POS终端申请消费，获得批准后，获得即时生成的贷款ID，并使用它来完成交易。
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