SQL 同一个表中 根据一列更新另一列(不同行)

update tab_wbap_wbs t
   set t.prepose_wbs_id =
       (select wbs_id
          from tab_wbap_wbs m
         where t.prepose_wbs_no = m.wbs_no
           and m.project_id = 281)
 where t.project_id = 281
  and t.prepose_wbs_no <> '0'
                      and (t.prepose_wbs_id = '0' or t.prepose_wbs_id is null)