When updating mysql, the condition is a query

scene ：
surface A Business unit table
There are business unit name and business unit code .
surface B Application table
It stores its own data and business unit name , Business unit code .

problem ： surface B The business unit code in is wrong , Now I want to modify and table A The business unit codes in are consistent . Two tables can be associated by business unit name .

solve ：

surface A And table B By business unit name （unit_name） Association as update condition

UPDATE uop_achieve ua,
sys_business_unit sbu 
SET ua.unit_code = sbu.unit_code 
WHERE
	sbu.unit_name = ua.unit_name