Question

我正在尝试执行一个查询，在该查询中检索属性以及来自其他表的值。我遇到的问题是，它只返回order_property_values表内匹配的结果行。我希望它返回所有结果，即使它在order_property_values表内找不到匹配项。

这是我现在要查询的内容。

SELECT * FROM `properties` as t1 
    LEFT JOIN `order_property_values` AS t2 
    ON t1.`id` =  t2.`property_id` 
    WHERE t1.`id` 
        IN (SELECT `property_id` FROM `assigned_properties` 
            WHERE `component_id` 
               IN (SELECT `component_id` FROM assigned_components 
                   WHERE `product_id` = (SELECT `product_id` 
                                         FROM `order_items` 
                                         WHERE `id` = 1)
                  )
            ) AND t2.`order_id` = 13

此查询以我想要的方式检索所有内容，但没有空匹配的行。

IN仅返回order_property_values表中可能存在/可能不存在的ID。

我已经尝试过NOT IN和IS NULL，但似乎无法正常工作。

预先感谢您保存一天。

Answer 1

SELECT * FROM `properties` as t1 
    LEFT JOIN `order_property_values` AS t2 
    ON t1.`id` =  t2.`property_id` AND t2.`order_id` = 13
    WHERE t1.`id` 
        IN (SELECT `property_id` FROM `assigned_properties` 
            WHERE `component_id` 
               IN (SELECT `component_id` FROM assigned_components 
                   WHERE `product_id` = (SELECT `product_id` 
                                         FROM `order_items` 
                                         WHERE `id` = 1)
                  )
            )

MySQL查询不返回订单属性表上的空行

1 个答案: