Question

我有一个表ValuationHistory，其中包含以下列

Code | ValuationDate | NetAssetValue | PricePerShare | Subscriptions | Redemptions  
ABC  | 2014-06-30    | 12546.50      | 100.23        | 60            | 70  
CEF  | 2014-06-30    | 10025.20      | 120.50        | 30            | 20  
ABC  | 2014-07-31    | 12505.50      | 101.50        | 40            | 60  
ABC  | 2014-08-31    | 13051.41      | 102.50        | 35            | 70

现在，用户将从aspx页面中选择评估日期和代码。我想编写一个sql查询，它将为我提供一个报告，其中包含用户选择的评估日期之前的所有评估日期的以下列

Code | BeginningEquity | Subscriptions | Redemptions | EndingEquity

哪里

Code是用户选择的代码
BeginningEquity是以前估值的NetAssetValue
Subscriptions很直接
Redemptions很直接
EndingEquity是NetAssetValue

valuationDate

我首先创建了一个名为@ValDates的表变量，并将所有评估日期记录到此临时表中。然后我与@ValDates表进行了ValuationHistory的连接。

但是我在以下查询中收到错误。错误消息是：

子查询返回了多个值

有人可以帮助我以更好的方式编写此查询吗

SELECT (SELECT NetAssetValue 
        FROM   ValuationHistory 
        WHERE  ValuationDate IN (SELECT Max(ValuationDate) 
                                 FROM   ValuationHistory 
                                 WHERE  ValuationDate < nd.ValuationDate)), 
       Subscriptions, 
       Redemptions, 
       EndingEquity 
FROM   ValuationHistory vh 
       INNER JOIN @ValDates vd 
               ON vh.ValuationDate = vd.ValuationDate 
WHERE  vh.Code = @Code 
       AND vh.ValuationDate < = @ValuationDate

Answer 1

我对你的要求不是很清楚。根据说明，您可以尝试按以下方式开始查询

DECLARE @Code VARCHAR(10) = 'ABC'
       ,@ValuationDate date = '2014-07-31'

;WITH cte AS (
  SELECT 
     rn = ROW_NUMBER() OVER (PARTITION BY Code ORDER BY ValuationDate), *
  FROM ValuationHistory
 )
SELECT 
  c1.Code,
  c2.NetAssetValue AS BeginningEquity,
  c2.ValuationDate AS BeginningDate,
  c1.NetAssetValue AS EndingEquity,
  c1.ValuationDate AS EndingDate,
  c1.[Subscriptions], 
  c1.[Redemptions]
from cte c1
LEFT JOIN cte c2 
  ON c1.Code = c2.Code
  AND c2.rn = c1.rn - 1
WHERE  c1.Code = @Code 
AND c1.ValuationDate < = @ValuationDate

SQL Fiddle Demo

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