我们已经通过将采购订单文档存储为 BLOB，在基本关系数据库中尽量保持采购订单表模式简单。

We have tried to keep the purchase order table schema simple in the relational-only database by storing the purchase order document as a BLOB.

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对我来说，原因很简单，工厂总量太多，产量过剩，现在客户们不愿意采购这么多产品。

There are too many factories in the world, making too many products, and at the moment customers don't want to buy so much, " he says.

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从一个简单的实际问题出发探讨了批量采购问题的数学模型的建立及其计算机求解的途径。

This paper discusses building of model of batch purchase and the way of computer evaluation from a simple and practical problem.

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