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现在要在优惠券的基础上添加针对商品的功能，数据库该怎么设计

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Release： 2016-06-06 20:33:05
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是直接在添加个商品ID字段，然后把商品ID拼接成字符串保存还是有其他方式?

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是直接在添加个商品ID字段，然后把商品ID拼接成字符串保存还是有其他方式?

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