mysql和sqlserver在使用update inner join时的区别

sqlserver

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。