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Id like to purchase what 我想要购买过夜所需的用品
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。
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