SQL聯盟問題

Question

這裏是我的查詢：

SELECT publicationId AS PublicationID 
    FROM dbo.PublicationOwner 
WHERE ownerId = 31331 
UNION 
SELECT AreaBuy.AreaBuyID AS PublicationID 
    FROM AreaBuy 
    JOIN PublicationAreaBuy ON AreaBuy.AreaBuyID = PublicationAreaBuy.AreaBuyID 
WHERE PublicationAreaBuy.PublicationID IN (SELECT publicationId 
               FROM dbo.PublicationOwner 
              WHERE ownerId = 31331) 
ORDER BY publicationId 

我所試圖做的是：

獲取的發佈ID的列表，其中所有者ID等於31331並添加（聯合）如果區域購買表中的發佈ID位於第一個查詢的結果中，則爲任何區域購買ID（如發佈ID）。

出了什麼問題？是的，31331是正確的所有者ID，並確實返回也在區域購買表中的出版物ID。

Answer 1

我喜歡這個遞歸CTE的想法，因爲我們想添加到原始列表中。

DECLARE @ownerid INT; 
SET @ownerid = 31331; 

WITH Publications AS 
(
SELECT publicationId AS PublicationID, 'P' AS Rowtype 
FROM dbo.PublicationOwner 
WHERE ownerId = @ownerid 

UNION ALL 

--Note, I am not using the AreaBuy table, because the info is in PublicationAreaBuy 
SELECT a.AreaBuyID, 'A' AS Rowtype 
FROM Publications AS p 
JOIN PublicationAreaBuy AS a 
ON a.PublicationID = p.PublicationID 
) 
SELECT * 
FROM Publications 
ORDER BY PublicationID 
; 

And ...執行連接將停止IN子句中NULL的任何問題。

編輯：接下來的這個查詢將在2005以前的版本SQL

DECLARE @ownerid INT 
SET @ownerid = 31331 

SELECT publicationId AS PublicationID, 'P' AS Rowtype 
FROM dbo.PublicationOwner 
WHERE ownerId = @ownerid 

UNION ALL 

--Note, I am not using the AreaBuy table, because the info is in PublicationAreaBuy 
SELECT a.AreaBuyID, 'A' AS Rowtype 
FROM (
     SELECT publicationId AS PublicationID, 'P' AS Rowtype 
     FROM dbo.PublicationOwner 
     WHERE ownerId = @ownerid 
    ) AS p 
JOIN PublicationAreaBuy AS a 
ON a.PublicationID = p.PublicationID 

ORDER BY PublicationID 

Answer 2

看起來像經典混搭。我沒有看到屬性publicationId和AreaBuyId之間的任何相似性。 這可能是他們只是非常糟糕的列:-)。這種不同屬性的聯合似乎並不是正確的路要走。

爲什麼犯規：

SELECT O.publicationId , A,AreaBuyId 
    FROM dbo.PublicationOwner O 
    LEFT OUTER JOIN dbo.AreaBuy A 
    ON O.AreaBuyId = A.AreaBuyId 
WHERE OwnerId =31331 

得到你想要的是什麼？