Oracle 將一個表中的字段值更新到另一個表的字段中

--使用where exists,則當數據存在時纔會更新
update  sysrole role set system_name = (select system_name from temp_sysrole temp where role.rolename=temp.rolename)
where exists
(select system_name from temp_sysrole temp where role.rolename=temp.rolename);