无效的记录从两个表

Question

我有笨

SELECT * FROM (`products`) LEFT JOIN `products_attributes` ON `products_attributes`.`product_id` = `products`.`id` WHERE `products`.`category` = '1' AND `products`.`sub_category` = '1' AND `products_attributes`.`attribute_id` = '3' AND `products_attributes`.`attribute_id` = '4' AND `products_attributes`.`attribute_id` = '5' GROUP BY `products`.`id` 

产生这个sql语句加入，我有这些表

产品： products_attributes：

我需要使用全部属性来获得产品因此，如果属性是3,4,5，并且属性是3,4,5,6，我将不会获得产品id = 1，所以我将获得产品id = 1。

Answer 1

您的sql查询是完全错误的。你所做的是： 给我记录attribute_id = 3 AND attribute_id = 4 AND attribute_id = 5 AND attribute_id = 6.一行不能同时等于3和4。 您需要的东西可以通过许多不同的方式实现。例如：

SELECT 
    products.id 
FROM products 

    JOIN products_attributes ON products_attributes.product_id = products.id 
WHERE 
    products.category = '1' 
    AND `products_attributes`.`attribute_id` IN (3,4,5,6) 


GROUP BY 
    products.id 
HAVING COUNT(DISTINCT `products_attributes`.`attribute_id`) = 4 

如果指定只是......那么它将把所有的记录谁已至少1这样attribute_id

Answer 2

试试这个：

SELECT * FROM (`products`) 
LEFT JOIN `products_attributes` 
ON `products_attributes`.`product_id` = `products`.`id` 
WHERE `products`.`category` = 1 
AND `products`.`sub_category` = 1 
AND `products_attributes`.`attribute_id` IN (3, 4, 5) 
GROUP BY `products`.`id`