电商网站,如何设计 排除不喜欢商品 ,怎么设计效率高呢?
不喜欢商品以什么样的结构保存,然而展示宝贝很多,每个用户不喜欢的商品又是千变万化,这怎么弄?每次用户查询的时候都要做删选,是不是会很浪费资源?
回复内容:
不喜欢商品以什么样的结构保存,然而展示宝贝很多,每个用户不喜欢的商品又是千变万化,这怎么弄?每次用户查询的时候都要做删选,是不是会很浪费资源?
不喜欢商品表:
product_id, user_id
查询:
1、 获得用户的不喜欢商品ID列表 = not_like_product_ids
2、 SELECT * FROM product WHERE id NOT IN (not_like_product_ids) AND ...
大致这么想到

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