一个检查在同一个供货商同一个ITEM中有多个Business Partner Catalog Numbers的Query

今天完成了一个检查在同一个供货商同一个ITEM中有多个Business Partner Catalog Numbers的Query， 如下：

SELECT ItemCode, CardCode, Substitute AS BPCatalogNo
FROM dbo.OSCN
WHERE (ItemCode IN
(SELECT ItemCode
FROM dbo.OSCN AS OSCN_3
GROUP BY ItemCode, CardCode
HAVING (COUNT(Substitute) > 1))) AND (CardCode NOT IN
(SELECT CardCode
FROM (SELECT CardCode
FROM dbo.OSCN AS OSCN_2
WHERE (ItemCode IN
(SELECT ItemCode
FROM dbo.OSCN AS OSCN_1
GROUP BY ItemCode, CardCode
HAVING (COUNT(Substitute) > 1)))) AS t1
GROUP BY CardCode
HAVING (COUNT(CardCode) = 1)))