不同类别不同字段如何实现？？
１. 如阿里巴巴发布产品时，当选择不同的类别时，对应的不同的产品字段发布， 这个逻辑关系是如何实现的， 数据表是怎么建立的，会的请帮忙！谢了
------解决方案--------------------
这里的关键在怎么建立产品字段表，按照需求你需要竖向建立。
你可以这样建。
id ：自增id
category ： 产品类别
name ： 产品字段
其中一个一个产品类别可以对应多个产品字段。
------解决方案--------------------
需求分析啊！建表你如果没有思路的话就一步步的来啊！
求人不如求自己！
你先发各个对象的属性还有各自的关系吧关系图做出来！
然后按照3个基本的范式进行建表就可以了！
------解决方案--------------------
EAV模式，
1 产品基本信息表；
2 产品分类与字段关系表；
3 所有字段表；
4 产品字段值表；
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