無效的記錄從兩個表

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` 

產生這個sql語句加入，我有這些表

產品： products_attributes：

我需要使用全部屬性來獲得產品因此，如果屬性是3,4,5，並且屬性是3,4,5,6，我將不會獲得產品id = 1，所以我將獲得產品id = 1。

Answer 1

您的sql查詢是完全錯誤的。你所做的是： 給我記錄attribute_id = 3 AND attribute_id = 4 AND attribute_id = 5 AND attribute_id = 6.一行不能同時等於3和4。 您需要的東西可以通過許多不同的方式實現。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......那麼它將把所有的記錄誰已至少1這樣attribute_id

Answer 2

試試這個：

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`