复杂的Sql Case语句获取错误的结果集

时间：2015-01-05 16:55:52

标签： sql sql-server-2008-r2 case

原始访问查询 

IIf([Package Type]="Bar",10,IIf([upper limit unit]="g",([UL3]*[weight factor]),[piece wt (g)]*[Upper Limit Factor])) AS [Upper Limit (g)]

SQL转换 

SELECT CASE WHEN [Package Type] = 'Bar' Then 10 
CASE WHEN [Upper Limit Unit] = 'g' Then ([UL3)] * [Weight Factor]
ELSE [Peice Wt(g)] * [Upper Limit Factor] END AS [Upper Limit (g)]

我在关键字ELSE＆＃34;附近遇到＃34;语法错误，查询的各个部分工作得非常好。

如何在case语句中引用多个case语句？请帮助

SELECT 
    CASE WHEN [Package Type] = 'Bar' THEN 10
    CASE WHEN [Upper Limit Unit] = 'g' 
           THEN CASE WHEN [Package Type] != NULL
                     THEN ([mav (g)] - [scale deviation factor] - [tare variation factor (g)]) / NULLIF ([weight factor], 0) 
           WHEN (mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)]) 
                 / NULLIF (nwmd.[Weight Factor], 0) 
                 - CAST((mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)]) 
                 / NULLIF (nwmd.[Weight Factor], 0) AS Int) 
                 = 0 
           THEN CAST((mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)])
                / NULLIF (nwmd.[Weight Factor], 0) AS Int) 
           WHEN (mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)]) 
                 / NULLIF (nwmd.[Weight Factor], 0) 
                 - CAST((mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)]) 
                 / NULLIF (nwmd.[Weight Factor], 0) AS Int) > 0 
                 AND 
                 (mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)]) 
                 / NULLIF (nwmd.[Weight Factor], 0) 
                 - CAST((mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)]) 
                 / NULLIF (nwmd.[Weight Factor], 0) AS Int)  < 0.51 
           THEN CAST((mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)])
                / NULLIF (nwmd.[Weight Factor], 0) AS Int) 
                + [Rounding Factor1] ELSE CAST((mav.[MAV (g)] - pl.[Scale Deviation Factor] - nwmd.[Tare Variation Factor (g)])
                / NULLIF (nwmd.[Weight Factor], 0) AS Int) + [Rounding Factor2] * NULLIF ( [Weight Factor],0)
           ELSE CASE WHEN [Upper Limit Unit] != 'g' 
                     THEN ([Label Wt (g)] / [Pcs Per Unit]) * [Upper Limit Factor] END AS [Upper Limit (g)]

FROM
    dbo.[Net Weight Master Data] nwmd
LEFT OUTER JOIN 
    dbo.[Production Lines] pl ON nwmd.[Production Line] = pl.[Production Line] 
INNER JOIN 
    dbo.[Maximum Allowable Variations] mav ON nwmd.[Label Wt (g)] = mav.[Labeled Quantity (g)] 
LEFT OUTER JOIN 
    dbo.ItemDescription I ON nwmd.[Unit UPC Base Item] = I.[Unit UPC Base Item]
ORDER BY 
    nwmd.[Unit UPC Base Item], 
    nwmd.[Production Line]

3 个答案:

答案 0 :(得分：1)

您有4 CASE且只有END，因此无法正常工作。

这是一个很大的混乱，但理想情况下你可以拆分通用标准来清理它，使用多个步骤比一个鸣喇叭嵌套CASE查询更容易阅读。

至少你需要更多END，缩进将有助于隔离错误：

SELECT 
CASE WHEN [Package Type] = 'Bar' 
     THEN 10 
     ELSE CASE WHEN [Upper Limit Unit] = 'g' 
               THEN CASE WHEN [Package Type] IS NOT NULL 
                         THEN ([mav (g)] - [scale deviation factor] - [tare variation factor (g)]) / NULLIF ([weight factor], 0) 
                         WHEN (MAV.[MAV (g)] - PL.[Scale Deviation Factor] - NWMD.[Tare Variation Factor (g)]) 
                                / NULLIF (NWMD.[Weight Factor], 0) - CAST((MAV.[MAV (g)] - PL.[Scale Deviation Factor] 
                                - NWMD.[Tare Variation Factor (g)]) / NULLIF (NWMD.[Weight Factor], 0) AS Int) = 0 
                         THEN CAST((MAV.[MAV (g)] - PL.[Scale Deviation Factor] - NWMD.[Tare Variation Factor (g)])
                            / NULLIF (NWMD.[Weight Factor], 0) AS Int) 
                         WHEN (MAV.[MAV (g)] - PL.[Scale Deviation Factor] - NWMD.[Tare Variation Factor (g)]) 
                            / NULLIF (NWMD.[Weight Factor], 0) - CAST((MAV.[MAV (g)] - PL.[Scale Deviation Factor] 
                            - NWMD.[Tare Variation Factor (g)]) / NULLIF (NWMD.[Weight Factor], 0) AS Int) > 0 AND 
                            (MAV.[MAV (g)] - PL.[Scale Deviation Factor] - NWMD.[Tare Variation Factor (g)]) 
                            / NULLIF (NWMD.[Weight Factor], 0) - CAST((MAV.[MAV (g)] - PL.[Scale Deviation Factor] 
                            - NWMD.[Tare Variation Factor (g)]) / NULLIF (NWMD.[Weight Factor], 0) AS Int) 
                            < 0.51 
                        THEN CAST((MAV.[MAV (g)] - PL.[Scale Deviation Factor] - NWMD.[Tare Variation Factor (g)])
                            / NULLIF (NWMD.[Weight Factor], 0) AS Int) + [Rounding Factor1] 
                        ELSE CAST((MAV.[MAV (g)]  
                          - PL.[Scale Deviation Factor] - NWMD.[Tare Variation Factor (g)])
                           / NULLIF (NWMD.[Weight Factor], 0) AS Int) + [Rounding Factor2] * NULLIF ( [Weight Factor],0) 
                        ELSE CASE WHEN [Upper Limit Unit] != 'g' --Double ELSE!
                                  THEN ([Label Wt (g)] / [Pcs Per Unit]) * [Upper Limit Factor] 
                             END
                  END
        END
END AS [Upper Limit (g)]
FROM         dbo.[Net Weight Master Data] NWMD LEFT OUTER JOIN
                      dbo.[Production Lines] PL ON NWMD.[Production Line] = PL.[Production Line] INNER JOIN
                      dbo.[Maximum Allowable Variations] MAV ON NWMD.[Label Wt (g)] = MAV.[Labeled Quantity (g)] LEFT OUTER JOIN
                      dbo.ItemDescription ID ON NWMD.[Unit UPC Base Item] = ID.[Unit UPC Base Item]
ORDER BY NWMD.[Unit UPC Base Item], NWMD.[Production Line]

更新：同样在一个ELSE中发现2 CASE，上面提到--Double ELSE!，每ELSE只能有一个CASE。正如Aaron所指出的，你在那里也有一个!= NULL，你需要IS NOT NULL。另外添加了表别名以进一步清理。

答案 1 :(得分：0)

虽然我预先格式化了您的原始文件以查看case / when / then构造的对齐失败，但我已经更进一步通过创建新的简化列来对数据元素进行预先查询来简化可读性。 mav - scale - tare“和NULLIF（权重因子），再次作为单个”DivideTest“通过”mav - scale - tare“/ NULLIF（权重因子，0）来自原始数据。

这允许外部查询使用这些简化的列名作为案例构造的基础以提高可读性。

我仍然不知道你想要为各自的休息时间做些什么，但希望这个版本能让你更清楚自己要做什么。而且我知道我没有正确的ELSE / END组件，因为目前还不清楚你想要得到什么。最后，我希望您知道除以零是一个无效值，因此当您测试NULLIF（[权重因子]，0）可能会导致您的案例构造中出现问题。

SELECT
      CASE WHEN PQ.pkgType = 'Bar' 
           THEN 10
           ELSE CASE WHEN [Upper Limit Unit] = 'g' 
                     THEN CASE WHEN PQ.pkgType != NULL
                                   THEN PQ.DivideTest
                               WHEN PQ.DivideTest - CAST( PQ.DivideTest AS Int) = 0 
                                   THEN CAST( PQ.DivideTest AS Int) = 0 
                               WHEN PQ.DivideTest - CAST( PQ.DivideTest AS Int) > 0 
                                           AND 
                                    PQ.DivideTest - CAST( PQ.DivideTest AS Int) < 0.51
                                  THEN CAST( PQ.DivideTest AS Int) + PQ.roundFactor1

                                  ELSE CAST( PQ.DivideTest AS Int) + PQ.roundFactor2 * PQ.WeightFactor
                                  END
                     ELSE CASE WHEN [Upper Limit Unit] != 'g' 
                     THEN PQ.notGWeight END AS [Upper Limit (g)]
           END
   from 
      ( SELECT 
              [Package Type] pkgType,
              [Upper Limit Unit] upperLimitUnit,
              NULLIF (nwmd.[weight factor], 0)  as weightFactor,
              (mav.[mav (g)] - pl.[scale deviation factor] - nwmd.[tare variation factor (g)]) / NULLIF (nwmd.[weight factor], 0) as DivideTest,
              [Rounding Factor1] roundFactor1,
              [Rounding Factor2] roundFactor2,
              ([Label Wt (g)] / [Pcs Per Unit]) * [Upper Limit Factor] notGWeight
           FROM
              dbo.[Net Weight Master Data] nwmd
                 LEFT OUTER JOIN dbo.[Production Lines] pl
                    ON nwmd.[Production Line] = pl.[Production Line] 
                 INNER JOIN dbo.[Maximum Allowable Variations] mav
                    ON nwmd.[Label Wt (g)] = mav.[Labeled Quantity (g)] 
                 LEFT OUTER JOIN dbo.ItemDescription I 
                    ON nwmd.[Unit UPC Base Item] = I.[Unit UPC Base Item]
           ORDER BY 
              nwmd.[Unit UPC Base Item], 
              nwmd.[Production Line] ) PQ

答案 2 :(得分：0)

在使用了所有您感兴趣的帮助后，我仍然面临语法问题，我通过放置＆＃34; End＆＃34;在相应的位置并删除额外的＆＃34; Else＆＃34;在查询中，最终的查询是：

SELECT [wmd].[Unit UPC Base Item], 
    CASE WHEN [Package Type] = 'Bar' Then 10  
            WHEN [Upper Limit Unit] != 'g' THEN ([Label Wt (g)] / [Pcs Per Unit])* ([Upper Limit Factor]) 
                WHEN [Upper Limit Unit] = 'g' THEN 
    CASE WHEN [Package Type] IS NOT NULL THEN ([mav (g)] - [scale deviation factor] - [tare variation factor (g)]) / NULLIF ([weight factor], 0) 
             WHEN (mav.[MAV (g)] - prod.[Scale Deviation Factor] - wmd.[Tare Variation Factor (g)]) 
                      / NULLIF (wmd.[Weight Factor], 0) 
                      - CAST((mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)]) 
                      / NULLIF (wmd.[Weight Factor], 0) AS Int) 
                      = 0 THEN CAST((mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)])
                       / NULLIF (wmd.[Weight Factor], 0) AS Int) 
             WHEN (mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)]) 
                      / NULLIF (wmd.[Weight Factor], 0) 
                      - CAST((mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)]) 
                      / NULLIF (wmd.[Weight Factor], 0) AS Int) > 0 AND 
                      (mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)]) 
                      / NULLIF (wmd.[Weight Factor], 0) 
                      - CAST((mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)]) 
                      / NULLIF (wmd.[Weight Factor], 0) AS Int) 
                      < 0.51 THEN CAST((mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)])
                       / NULLIF (wmd.[Weight Factor], 0) AS Int) 
                      + [Rounding Factor1] 
             ELSE CAST((mav.[MAV (g)] - prod.[Scale Deviation Factor] - [wmd].[Tare Variation Factor (g)])
                       / NULLIF (wmd.[Weight Factor], 0) AS Int) + [Rounding Factor2]  
              END *([Weight Factor])
              END AS [UpperLimit(g)] 

FROM         dbo.[Net Weight Master Data] AS wmd LEFT OUTER JOIN
                      dbo.[Production Lines] AS prod ON wmd.[Production Line] = prod.[Production Line] INNER JOIN
                      dbo.[Maximum Allowable Variations] AS mav ON wmd.[Label Wt (g)] = mav.[Labeled Quantity (g)] LEFT OUTER JOIN
                      dbo.ItemDescription ON wmd.[Unit UPC Base Item] = dbo.ItemDescription.[Unit UPC Base Item]
ORDER BY wmd.[Unit UPC Base Item], wmd.[Production Line]
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