SQL2005的CTE
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use
test
go
if
object_id
(
'
Tempdb..#T
'
)
is
not
null
drop
table
#T
create
table
#T(ID
int
,Name
nvarchar
(
100
),parentID
int
)
insert
#T
select
1
,
'
A
'
,
0
insert
#T
select
2
,
'
B
'
,
1
insert
#T
select
3
,
'
C
'
,
1
insert
#T
select
4
,
'
D
'
,
3
insert
#T
select
5
,
'
E
'
,
2
go
with
t2(ID,Name,parentID,Ord,Lev)
as
(
select
*
,Ord
=
cast
(
right
(
'
0000
'
+
rtrim
(ID),
4
)
as
nvarchar
(
max
)),Lev
=
cast
(
0
as
int
)
from
#T
where
ParentID
=
0
union
all
select
b.
*
,Ord
=
a.Ord
+
cast
(
right
(
'
0000
'
+
rtrim
(b.ID),
4
)
as
nvarchar
(
max
)),Lev
=
cast
(a.Lev
+
1
as
int
)
from
#T b
join
t2 a
on
b.ParentID
=
a.ID)
select
顯示
=
replicate
(
char
(
9
),lev)
+
Name
from
T2
order
by
ord
option
(maxrecursion
0
)
--
用空格替換制表符時用space(lev*2)/replicate(char(9),lev)
/**/
/*
顯示---------------------------------A B E C D(5 個資料列受到影響)
*/
;
with
t2
as
(
select
*
,Ord
=
cast
(Name
as
nvarchar
(
max
)),lev
=
0
from
#T
where
ParentID
=
0
union
all
select
b.
*
,Ord
=
cast
(a.Ord
+
char
(
9
)
+
b.Name
as
nvarchar
(
max
)),a.lev
+
1
from
#T b
join
t2 a
on
b.ParentID
=
a.ID )
select
[
顯示
]
=
Ord
from
T2
order
by
ord
option
(maxrecursion
0
)
/**/
/*顯示--------------------AA BA B EA CA C D(5 個資料列受到影響)*/
--
2005多次调用连接时:
/**/
/*;with T(COl)--可指定列名也可不指定as(......),T2(Co)as(......)select * from T1 a join T2 b on a.Col=b.COl*/
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