需求
现有两张表
都有城市字段 city_name
现在想把其中一张表的某个字段对应的值,依据城市关联 赋值到另一张表中的某个字段
sql代码:
UPDATE `c_citys_code_new` t,`c_citys_code3` c3 SET t.car_head = ( SELECT car_head FROM `c_citys_code3` c WHERE c.`city_name` = c3.`city_name` AND t.`city_name` = c.`city_name` ) WHERE t.city_name = c3.`city_name`