Question

我已经创建了一个查询，我希望结果如下所示：

Reporting Date    Fund    AssetClass    %
31/10/2012        1       Equity        10
31/10/2012        1       Bond          40
31/10/2012        1       Cash          40
31/10/2012        1       Balanced      10
31/10/2012        1       Other         0

我上面的问题是％为0，显然没有显示，因为没有数据。不过我想表现出来。

所以我认为最好的解决方案是创建一个包含所有资产类的临时表，然后从我的工作表中右键加入它，这样就可以填充没有数据的行。代码如下：

SELECT 
    ReportingDate
,   PortfolioID
,   AC.AssetClass
,   ROW_NUMBER() OVER (PARTITION BY PortfolioID ORDER BY SUM(Percentage) DESC) AS [Rank]
,   CAST(SUM(Percentage) AS DECIMAL(22,1))  AS [Weight]

FROM @Worktable as WT

RIGHT OUTER JOIN @AssetClass AS AC
    ON WT.AssetClass = AC.AssetClass

GROUP BY WT.ReportingDate, WT.PortfolioID, AC.AssetClass

ORDER BY [Weight] DESC

我的问题是，当它返回时，它看起来像这样：

Reporting Date    Fund    AssetClass    %
31/10/2012        1       Equity        10
31/10/2012        1       Bond          40
31/10/2012        1       Cash          40
31/10/2012        1       Balanced      10
NULL              NULL    Other         NULL

如何使用此脚本中的数据填充NULL？还有其他更好的方法吗？

Answer 1

SELECT 
    CASE WHEN Reporting IS NULL THEN MAX(Reporting) OVER (PARTITION BY (SELECT 1)) ELSE Reporting END AS Reporting
,   CASE WHEN Fund IS NULL THEN MAX(Fund) OVER (PARTITION BY (SELECT 1)) ELSE Fund END AS Fund
,   PortfolioID
,   AC.AssetClass
,   ROW_NUMBER() OVER (PARTITION BY PortfolioID ORDER BY SUM(Percentage) DESC) AS [Rank]
,   CAST(SUM(ISNULL(Percentage, 0)) AS DECIMAL(22,1))  AS [Weight]
FROM @Worktable as WT
RIGHT OUTER JOIN @AssetClass AS AC
    ON WT.AssetClass = AC.AssetClass
GROUP BY WT.ReportingDate, WT.PortfolioID, AC.AssetClass
ORDER BY [Weight] DESC

如果不存在数据则返回数据 - 使用数据填充空值

1 个答案: