--创建表
create table TableA (
  A_id number ,
  name varchar2(1024) ,
  uuid varchar2(36) ,
  version varchar2(50),  
  MMMM varchar2(40),
  NNNN varchar2(50),
  B_id number , --新加的字段，全部为空
  primary key (A_id)
);


--插入数据
insert into TableA(a_id, uuid, name, version) values(1, 'uid1', 'abc', 'version_1');
insert into TableA(a_id, uuid, name, version) values(2, 'uid1', 'abc', 'version_1');
insert into TableA(a_id, uuid, name, version) values(3, 'uid1', 'abc', 'version_1');
insert into TableA(a_id, uuid, name, version) values(4, 'uid1', 'abc', 'version_1');
insert into TableA(a_id, uuid, name, version) values(5, 'uid1', 'abc', 'version_1');
insert into TableA(a_id, uuid, name, version) values(6, 'uid2', 'abcd', 'version_2');
commit;


--数据更新
merge into TableA a
using (select t.*, rownum as b_id
         from (select uuid, version from TableA
                group by uuid, name, version) t) b
   on (a.uuid = b.uuid and a.version = b.version)
 when matched then
update set a.b_id = b.b_id;
commit;

--数据查询
select * from TableA;

      A_ID NAME           UUID         VERSION        MMMM           NNNN                 B_ID
---------- -------------- ------------ -------------- -------------- -------------- ----------
         1 abc            uid1         version_1                                             1
         2 abc            uid1         version_1                                             1
         3 abc            uid1         version_1                                             1
         4 abc            uid1         version_1                                             1
         5 abc            uid1         version_1                                             1
         6 abcd           uid2         version_2                                             2

------解决方案--------------------

由于没有数据库工具，大概写了下，可能有错误，只是个思路，你可以试试

SQL code

create or replace procedure A as

begin

insert into TableB (B_id, name, uuid, version)
select rownum as  B_id, name, uuid, version from(
select distinct d.name, d.uuid, d.version from TableA);

update TableA set B_id = (select B_id from TableB where TableB.uuid = TableA.uuid and TableB.version = TableA.version);

end;