mysql - 从过滤器中选择产品

Question

我有一个查询问题：

我有 3 个表： products (id, name) settings (id, name) product_setting (product_id, setting_id)

例如：我想只选择您选择过滤器的产品！

我这样做：

SELECT p. *, s.id as setting
FROM Products p
INNER JOIN product_setting p2 ON (p.id = p2.product_id)
INNER JOIN settings s ON (s.id = p2.setting_id)
WHERE s.id IN (1,2)

但我得到了所有具有“设置”id = 1 或 id = 2 的产品。如何只获得那些具有这些“设置”（AND）的产品？

谢谢！！

Answer 1

SELECT p.*, s.id as setting
FROM Products p
INNER JOIN product_setting p2 ON (p.id = p2.product_id)
INNER JOIN settings s ON (s.id = p2.setting_id)
WHERE s.id IN (1,2)
GROUP BY p.id
HAVING COUNT(*)=2; // size of IN()

Answer 2

这似乎是过度杀戮，但......

SELECT p. *, s.id as setting
FROM Products p
INNER JOIN product_setting p2 ON (p.id = p2.product_id)
INNER JOIN settings s ON (s.id = p2.setting_id)
INNER JOIN settings s2 ON (s.id = p2.setting_id)
WHERE 
    s.id = 1
    AND s2.id = 2