mysql用一个表更新另一个表

http://www.cnblogs.com/emanlee/p/4231976.html

Solution 1:  修改1列

update student s, city c
   set s.city_name = c.name
 where s.city_code = c.code;

Solution 2:  修改多个列  (亲测可用)

update  a,  b 

set a.title=b.title, a.name=b.name
where a.id=b.id

Solution 3: 采用子查询

update student s set city_name = (select name from city where code = s.city_code);