Question

我的查询有问题：

我有3张桌子：产品（id，name）设置（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)

但我得到的所有产品都有'设置'id = 1或id = 2。如何只获得那些具有'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

这似乎过度杀人但是......

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

从过滤器中选择产品

2 个答案: