＃1241 - 操作数应该包含1列 - 为什么我得到这个？

Question

我想运行一个查询，但我得到了上述错误。任何人都可以让我知道为什么我会得到它。

UPDATE `catalog_eav_attribute` 
SET `used_for_sort_by` = 1 
WHERE attribute_id = (
SELECT * FROM `eav_attribute` WHERE `entity_type_id` = (SELECT `entity_type_id` FROM `eav_entity_type` WHERE `entity_model` = "catalog/product") AND `attribute_code` = "created_at"); 

Answer 1

您有attribute_id = (select * . . .。据推测，eav_attribute有多个列。

您需要指定特定的列，这样的事情：

UPDATE `catalog_eav_attribute` 
    SET `used_for_sort_by` = 1 
    WHERE attribute_id = (SELECT ea.attribute_id -- this is a guess 
          FROM `eav_attribute` ea 
          WHERE `entity_type_id` = (SELECT `entity_type_id` 
                FROM `eav_entity_type` 
                WHERE `entity_model` = 'catalog/product' 
                ) AND 
           `attribute_code` = 'created_at' 
         );