＃1052-字段列表中的“日期”列不明確

Question

update callingroute AS t1
INNER JOIN callingroute AS t2                
SET t1.day = (select date FROM (select dayname(date) from callingroute where status = 'OK')AS X) 
WHERE t1.calling_route_id IS NOT NULL;

//知道我為什么會遇到這些錯誤

Answer 1

如果有任何查詢應縮短為

update callingroute AS t1                
SET t1.day = dayname(date) 
WHERE t1.calling_route_id IS NOT NULL
  AND status = 'OK';