而是在乘法子查询中使用空白值

Question

我在 Sybase 中有这个 SQL 来获取价格乘以 quetity 的累积值，但是当我希望它显示实际值时它给出了空白值。

这是我的代码：

    SELECT Pmu.IdVal, Pmu.IdInt, Pmu.IdNumEcrPpal, Pmu.IdSensOpe, Pmu.DtEcr, Pmu.QteEcr, Pmu.PrixAcquis,
    (SELECT SUM(p1.QteEcr)
            FROM   casimir.dbo.Pmu p1
            WHERE  p1.IdNumEcrPpal < Pmu.IdNumEcrPpal and p1.IdInt = Pmu.IdInt) AS QCP,
     (SELECT SUM(p2.QteEcr * p2.PrixAcquis) 
            FROM   casimir.dbo.Pmu p2
            WHERE  p2.IdNumEcrPpal < Pmu.IdNumEcrPpal and p2.IdInt = Pmu.IdInt) AS PRUP 

    FROM casimir.dbo.Pmu Pmu

    where IdInt = 1733

order by IdNumEcrPpal

结果如下：

IdVal * IdInt * IdNumEcrPpal *  QteEcr *    PrixAcquis *    QCP PRUP
650     1733    1074292               69    0.00         {null} {null}
650     1733    1165538               6     0.00            69  0.00
650     1733    1618644               7     0.00            75  0.00
650     1733    1934483               10    0.00            82  0.00
650     1733    1934484               1     0.00            92  0.00
650     1733    2140552               93    0.00            93  0.00
650     1733    2506329               200   0.00            186 0.00
650     1733    2515839               100   0.00            386 0.00
650     1733    2520087               110   0.00            486 0.00
650     1733    2572565               400   0.00            596 0.00
650     1733    2581126               1     0.00            996 0.00
650     1733    2858466               56    0.00            997 0.00
650     1733    2907483               6     0.00            1053 0.00
650     1733    3227255               7     0.00            1059 0.00
650     1733    3440560               173   0.00            1066 0.00
650     1733    3440727               67    0.00            1239 0.00
650     1733    3467592               100   0.00            1306 0.00
650     1733    3482135               100   188.00          1406 0.00
650     1733    3483475               30    185.35          1506    
650     1733    3491124               350   0.00            1536    
650     1733    3717502               70    0.00            1886    
650     1733    3717503               4     0.00            1956    
650     1733    4046744               20    65.44           1960    
650     1733    4047669               200   0.00            1980    
650     1733    4059311               150   67.12           2180    
650     1733    4101861               200   0.00            2330    
650     1733    4118371               36    0.00            2530    
650     1733    4118372               3     0.00            2566    

PRUP 列给了我正确的值，但之后给了空白值。

任何想法

Answer 1

你需要使用ISNULL函数

SELECT Pmu.IdVal, Pmu.IdInt, Pmu.IdNumEcrPpal, Pmu.IdSensOpe, Pmu.DtEcr, Pmu.QteEcr, Pmu.PrixAcquis,
isnull((SELECT SUM(p1.QteEcr)
        FROM   casimir.dbo.Pmu p1
        WHERE  p1.IdNumEcrPpal < Pmu.IdNumEcrPpal and p1.IdInt = Pmu.IdInt),0) AS QCP,
 isnull((SELECT SUM(isnull(p2.QteEcr,1) * isnull(p2.PrixAcquis,1)) 
        FROM   casimir.dbo.Pmu p2
        WHERE  p2.IdNumEcrPpal < Pmu.IdNumEcrPpal and p2.IdInt = Pmu.IdInt),0) AS PRUP 
FROM casimir.dbo.Pmu Pmu
where IdInt = 1733
order by IdNumEcrPpal

您也可以改用coalesce 函数。

Answer 2

我编辑了我的查询。也请参考链接http://sqlfiddle.com/#!2/c48ec/27

SELECT Pmu.IdVal, Pmu.IdInt, Pmu.IdNumEcrPpal, Pmu.QteEcr, Pmu.PrixAcquis
   ,
    (SELECT SUM(p1.QteEcr)
            FROM   Pmu p1
            WHERE  p1.IdNumEcrPpal < Pmu.IdNumEcrPpal and p1.IdInt = Pmu.IdInt) AS QCP,

     coalesce ((SELECT SUM( coalesce (p2.QteEcr,0) *  coalesce (p2.PrixAcquis,0)) 
            FROM   Pmu p2
            WHERE  p2.IdNumEcrPpal < Pmu.IdNumEcrPpal and p2.IdInt = Pmu.IdInt),0) AS PRUP

 FROM Pmu Pmu

    where IdInt = 1733

order by IdNumEcrPpal