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我是CTE的新手,我試圖弄清楚這一點。 我有一個表格,用於存儲所有合同,我擁有最新合同「合同A」的記錄,我希望通過歷史順序回顧相關合同,以找到具有特定標準的最新合同,有時候它會是我已經擁有的合同。有時深一層,也許深達5層。我建了一個CTE,它限制了記錄與「合同A」相關的記錄,但它進入一個無限循環和SQL殺死它BTW,我使用SQL Server 2008的 這裏是代碼我有:通過記錄歷史記錄找回想要的記錄的遞歸查找
CREATE TABLE #t_Contracts
( ContractOID INT NOT NULL
, SystemSourceOID SMALLINT NOT NULL
)
--"Contract A"
INSERT #t_Contracts
SELECT 7463027, 2
WITH Contract_CTE (ContractOID, SystemSourceOID, PrevContractOID, ProductCodeType,Comment, Contractlevel)
AS
(
--Anchor with "Contract A"
SELECT CON.ContractOID, CON.SystemSourceOID, CON.PrevContractOID, PRD.ProductCodeType, PRD.Comment, 0 AS Contractlevel
FROM UBASS.dbo.[Contract] AS CON
INNER JOIN #t_Contracts AS TMP ON CON.ContractOID = TMP.ContractOID
AND CON.SystemSourceOID = TMP.SystemSourceOID
INNER JOIN UBASS.dbo.Product AS PRD ON CON.ProductOID = PRD.ProductOID
AND CON.SystemSourceOID = PRD.SystemSourceOID
UNION ALL
--"Contract A" Previous contracts
SELECT CON.ContractOID, CON.SystemSourceOID, CON.PrevContractOID, PRD.ProductCodeType, PRD.Comment, Contractlevel + 1
FROM UBASS.dbo.[Contract] AS CON
INNER JOIN Contract_CTE AS pCON ON pCON.PrevContractOID = CON.ContractOID
AND CON.SystemSourceOID = pCON.SystemSourceOID
INNER JOIN UBASS.dbo.Product AS PRD ON CON.ProductOID = PRD.ProductOID
AND CON.SystemSourceOID = PRD.SystemSourceOID
)
SELECT * FROM Contract_CTE
WHERE
ProductCodeType NOT IN ('MPP','RBP','STP','RCP','BNE')
AND Comment != 'RETENTION'
--WHERE ContractOID = 7463027 AND SystemSourceOID = 2
無限循環已經解決,這是一個數據問題,最古老的契約的PrevContractOID指向一個新的契約,而不是空的。但我現在得到重複的記錄。它不返回3條記錄,而是每條記錄返回6條記錄。 – greektreat 2011-06-13 15:32:38