Mysql中批量替换某个字段的部分数据(推荐)

UPDATE 表A SET 字段B = replace(字段B, 'aaa', 'bbb')
 example: update table set url= replace(url, 'aaa', 'bbb') 【将url字段中的aaa批量更改为bbb】
  update table set url= REPLACE (url,'3','1.png') where 条件; 

update table set column='' where column is null 
列：update `table` set `url`='0' where `url` is null 

UPDATE person SET urls = (REPLACE(urls,'xh',id));