这意味着，每当股市值达到订货点水平，我们必须创建采购订单，而购令应该被授权。

Which means, whenever the stock value reaches reorder level, we have to create purchase order, and the purchased order should be authorized.

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用于创建采购订单的XML代码和关系代码大部分都相同，惟一的差别是用于查找产品当前价格的查询。

The XML code and the relational code to create the purchase order are mostly identical, with the only difference being the query to find the current price of the product.

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在采购订单和产品表之间创建联接以获取产品详细信息。

Create a join between the purchase order and the product table to get product details.

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