[英]Mysql get the common categories of products
I am trying to create a filtering sistem for products. 我正在尝试为产品创建过滤系统。
I have: 我有:
I want to search the table of products and from the results to create the common categories that they have so they can be filtered even more. 我想搜索产品表,然后从结果中创建它们具有的常见类别,以便可以对其进行更多过滤。
How do I get only the categories that are found in all the products list? 如何仅获得所有产品列表中的类别?
Thanks for any help! 谢谢你的帮助!
You can use the following query: 您可以使用以下查询:
SELECT id_category
FROM (SELECT id_category, COUNT(DISTINCT id_product) AS cnt
FROM associations
GROUP BY id_category ) AS t
WHERE t.cnt = (SELECT COUNT(DISTINCT id) FROM products)
This will return all category ids that are related to all products stored in the products
table. 这将返回与
products
表中存储的所有产品相关的所有类别ID。
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