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订单表如何设计

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订单表如何设计

订单有数量，单价，总价
我想问一下总价计算后要不要存库。啥时计算


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这类字段一般最好存库，因为单价有可能是会调整的 如果单价发生变化了，总价也会变，这样订单表就比较明了。并且做查询的时候可以直接查总价字段了，不用任何表达式。
在保存当前订单时 计算总价 并一起保存库中


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