两表生成一表,该如何处理

两表生成一表
怎样把下面两表:
dwID     dwName     dwParentID
1             AAA           0
2             BBB           1
3             CCC           1
4             DDD           2

和
gzID     gzName     gzDw
1             MMM         2
2             XXX         3
3             YYY         3
生成下面一表:
ID         Name       ParentID
1           AAA           0                         //单位保留原来的ID,NAME,和父ID
2           BBB           1
1           MMM           2                         //职工将单位作为父ID
3           CCC           1      
2           XXX           3
3           YYY           3


------解决方案--------------------
修改下

Select ID, Name, ParentID From
(
Select dwID As ID, dwName As Name, dwParentID As ParentID, 0 As Flag, dwID As OrderID From 单位
Union All
Select *, 1 As Flag, gzDw From 职工
) A
Order By OrderID, Flag, ID
------解决方案--------------------
create table t1(
dwID int,
dwName varchar(10),
dwParentID char(1)
)
insert t1
select 1, 'AAA ', '0 ' union all
select 2, 'BBB ', '1 ' union all
select 3, 'CCC ', '1 ' union all
select 4, 'DDD ', '2 '

create table t2(
gzID int,
gzName varchar(10),
gzDw char(1)
)
insert t2
select 1, 'MMM ', '2 'union all
select 2, 'XXX ', '3 'union all
select 3, 'YYY ', '3 '

select dwID as 'ID ',dwName as 'Name ',dwParentID as 'ParentID ' from t1
union all
select gzID,gzName,gzDw from t2

--result:
ID Name ParentID
---------------------------------
1 AAA 0
2 BBB 1
3 CCC 1
4 DDD 2
1 MMM 2
2 XXX 3
3 YYY 3

--想要楼主那样的结果，排序好像还真不好排诶