Sql Server 与 MySql 在使用 update inner join 时的区别

Posted 2020-09-08 只有睿智的河水知道

Sql Server

update tb_User    
set pass = ‘‘-- 此处pass前不要加 tb_User 别名usr  
from tb_User usr    
inner join tb_Address addr on usr.nAddressFK = addr.nAddressID    
where usr.id=123  

 

mysql

UPDATE mem_world AS mw1 INNER JOIN mem_world AS mw2 
ON mw1.parentid = mw2.wid 
SET mw1.level = mw2.level 
WHERE mw2.baseid = 107 
AND mw2.parentid = 0 
AND mw2.size > 1; 

 

一个是先set再关联，另外一个是先关联再set。