上下级的关系,订单与子订单的关系,谢谢各位高手.

with T AS(

SELECT '111'AS A, ''AS B UNION ALL

SELECT '222'AS A, '111'AS B UNION ALL

SELECT '333'AS A, '222'AS B UNION ALL

SELECT '444'AS A, '111'AS B UNION ALL

SELECT '555'AS A, ''AS B 

)

,tree AS(

    SELECT *,

           CONVERT(varchar(30),A) AS V2

      FROM t

     WHERE B=''

    UNION ALL

    SELECT t.*,

           CONVERT(varchar(30),tree.V2+'\'+t.A) AS V2

      FROM tree

      JOIN t

        ON tree.A = t.B

)

    SELECT A AS V1,

           V2

      FROM tree

  ORDER BY V2

V1   V2

---- ------------------------------

111  111

222  111\222

333  111\222\333

444  111\444

555  555

SELECT v4 AS v1  ,isnull(v1,'') 
	+ ' ' + isnull(v2,'') + ' ' + isnull(v3,'') AS v2 FROM 

(SELECT a AS v1 ,NULL AS v2,NULL AS v3,a AS v4 FROM #t1 WHERE len(isnull(b,''))=0

UNION
SELECT b AS v1,a AS v2,NULL AS v3,a AS v4 FROM #t1 WHERE b IN(SELECT a AS v1 FROM #t1 WHERE len(isnull(b,''))=0)

UNION

SELECT tt1.v1,tt1.v2,a AS v3,a AS v4 FROM #t1 
INNER JOIN 
(SELECT b AS v1,a AS v2,NULL AS v3 FROM #t1 WHERE b IN(SELECT a AS v1 FROM #t1 WHERE len(isnull(b,''))=0)) AS tt1
ON #t1.b=tt1.v2) AS tt2

--呵呵，上面都錯了，試試以下這個：
WITH T AS(
SELECT '111'AS A, ''AS B UNION ALL
SELECT '222'AS A, '111'AS B UNION ALL
SELECT '333'AS A, '222'AS B UNION ALL
SELECT '444'AS A, '111'AS B UNION ALL
SELECT '555'AS A, ''AS B 
)
,a1 AS
(
SELECT a,b,CAST(b+CASE WHEN b='' THEN '' ELSE '/' END+a AS VARCHAR(MAX)) c,1 d FROM t
UNION ALL
SELECT a1.a,t.b,CAST(t.b+'/'+a1.c AS VARCHAR(MAX)),d+1
FROM a1
JOIN t ON a1.b=t.a
WHERE t.b<>''
)
,a2 AS
(
SELECT a,MAX(d) d FROM a1 GROUP BY a
)
SELECT a1.a v1,a1.c v2
FROM a1
JOIN a2 ON a1.a=a2.a AND a1.d=a2.d
ORDER BY 1

--或者：
WITH T AS(
SELECT '111'AS A, ''AS B UNION ALL
SELECT '222'AS A, '111'AS B UNION ALL
SELECT '333'AS A, '222'AS B UNION ALL
SELECT '444'AS A, '111'AS B UNION ALL
SELECT '555'AS A, ''AS B 
)
,a1 AS
(
SELECT a,b,CAST(a+CASE WHEN b='' THEN '' ELSE '/' END+b AS VARCHAR(MAX)) c,1 d FROM t
UNION ALL
SELECT a1.a,t.b,CAST(a1.c+'/'+t.b AS VARCHAR(MAX)),d+1
FROM a1
JOIN t ON a1.b=t.a
WHERE t.b<>''
)
,a2 AS
(
SELECT a,MAX(d) d FROM a1 GROUP BY a
)
SELECT a1.a v1,REVERSE(a1.c) v2
FROM a1
JOIN a2 ON a1.a=a2.a AND a1.d=a2.d
ORDER BY 1

WITH T AS(
SELECT '111'AS A, ''AS B UNION ALL
SELECT '222'AS A, '111'AS B UNION ALL
SELECT '333'AS A, '222'AS B UNION ALL
SELECT '444'AS A, '111'AS B UNION ALL
SELECT '555'AS A, ''AS B 
)
,a1 AS
(
SELECT a,b,CAST(a+'/'+b AS VARCHAR(MAX)) c,1 d FROM t WHERE b<>''
UNION ALL
SELECT a1.a,t.b,CAST(a1.c+'/'+t.b AS VARCHAR(MAX)),d+1
FROM a1
JOIN t ON a1.b=t.a
WHERE t.b<>''
)
,a2 AS
(
SELECT a,MAX(d) d FROM a1 GROUP BY a
)
SELECT a1.a v1,REVERSE(a1.c) v2
FROM a1
JOIN a2 ON a1.a=a2.a AND a1.d=a2.d
UNION ALL
SELECT a,a FROM t WHERE b=''
ORDER BY 1