MySQL错误：冲突：1052 where子句不明确的列'created_at'

Question

我遇到了问题：

违反完整性约束：1052 where子句不明确的列“ created_at”

但是表sales_flat_order_grid具有created_at 列

SELECT DISTINCT main_table.*, 
                blacklist.entity_id AS marked 
FROM   sales_flat_order_grid AS main_table 
       LEFT JOIN (SELECT main_table.* 
                  FROM   plugincompany_blacklist_item AS main_table 
                  WHERE  ( order_id != '0' ) 
                  GROUP  BY order_id) AS blacklist 
              ON main_table.entity_id = blacklist.order_id 
WHERE  ( created_at >= '2016-11-03 00:00:00' 
         AND created_at <= '2016-11-26 23:59:59' ) 

Answer 1

两个表都有一个created_at子句。 所以mysql不知道该取哪个。 您需要清楚这一点：

WHERE  ( main_table.created_at >= '2016-11-03 00:00:00' 
     AND main_table.created_at <= '2016-11-26 23:59:59' )