sql update级联关联更新操作

sql update级联关联更新操作

update mv_table_user U
   set (province_id,province_name,city_id, city_name) =
    (select T.province_id,T.province_name,T.city_id,T.city_name
    FROM mv_table_tmp T WHERE T.ID = U.ID)
 where EXISTS (select 1 FROM mv_table_tmp T WHERE T.ID = U.ID)