SQL服务器：多行返回CASE WHEN

我想从一个表中选择特定数据集，然后显示他们下了单场分组。然而，这为每个案例陈述创建一条线。SQL服务器：多行返回CASE WHEN

我非常希望看到与每个反对领域的每一个报价单行。

有没有人有任何想法如何，我可以改进什么香港专业教育学院这样做的远？

select 
    KeyField as Quote, 
    CASE WHEN FieldName = 'QTY001' THEN AlphaValue ELSE null END as [QTY], 
    CASE WHEN FieldName = 'CON002' THEN AlphaValue ELSE null END as [Conductors], 
    CASE WHEN FieldName = 'COP001' THEN AlphaValue ELSE null END as [Copper Size], 
    CASE WHEN FieldName = 'COR001' THEN AlphaValue ELSE null END as [Core Length], 
    CASE WHEN FieldName = 'COR002' THEN AlphaValue ELSE null END as [Core Inside], 
    CASE WHEN FieldName = 'END001' THEN AlphaValue ELSE null END as [End Winding], 
    CASE WHEN FieldName = 'KV_001' THEN AlphaValue ELSE null END as [KV], 
    CASE WHEN FieldName = 'KW_001' THEN AlphaValue ELSE null END as [KW], 
    CASE WHEN FieldName = 'NAM001' THEN AlphaValue ELSE null END as [OEM], 
    CASE WHEN FieldName = 'SLO001' THEN AlphaValue ELSE null END as [Slots], 
    CASE WHEN FieldName = 'SPE001' THEN AlphaValue ELSE null END as [Speed], 
    CASE WHEN FieldName = 'TUR001' THEN AlphaValue ELSE null END as [Turns], 
    CASE WHEN FieldName = 'TYP001' THEN AlphaValue ELSE null END as [Type/Description] 
from 
    AdmFormData 
where 
    FormType = 'QOT'

来源

2013-05-16 Lewis Cooksey

你能为你的当前和所需输出 – WiiMaxx

添加GROUP BY条款

SELECT ..., 
     MAX(CASE WHEN FieldName = 'QTY001' THEN AlphaValue ELSE null END) as [QTY], 
     ..... 
FROM... 
WHERE... 
GROUP BY KeyField

来源

2013-05-16 09:11:20

提供简单的例子，当你知道怎么回事，就知道本集团，但不是MAX，非常感谢你。 –

您的欢迎'：）' –

作为替代多个case when ...语句，你可以使用的SQLServer的PIVOT设施：

select 
    KeyField as Quote, 
    [QTY001] as [QTY], 
    [CON002] as [Conductors], 
    [COP001] as [Copper Size], 
    [COR001] as [Core Length], 
    [COR002] as [Core Inside], 
    [END001] as [End Winding], 
    [KV_001] as [KV], 
    [KW_001] as [KW], 
    [NAM001] as [OEM], 
    [SLO001] as [Slots], 
    [SPE001] as [Speed], 
    [TUR001] as [Turns], 
    [TYP001] as [Type/Description] 
from 
    (select KeyField, FieldName, AlphaValue 
    from AdmFormData 
    where FormType ='QOT') as s 
pivot 
    (max(AlphaValue) for FieldName in 
    ([QTY001], [CON002], [COP001], [COR001], [COR002], [END001], [KV_001], [KW_001], [NAM001], [SLO001], [SPE001], [TUR001], [TYP001]) 
    ) as p

来源

2013-05-16 09:53:59

如果你有MSSQL 2005年及以上的，你可以使用PIVOT命令：

SELECT KeyField, [QTY001], [CON002], [COR001] 
FROM (
    SELECT KeyField, FieldName, AlphaValue FROM data 
) AS SourceTable 
PIVOT (
    MAX(AlphaValue) 
    FOR FieldName IN([QTY001], [CON002], [COR001]) 
) AS PivotTable

在其他情况下，您的解决方案是实现的唯一途径。

SQLFiddle

来源

2013-05-16 09:55:15

SQL服务器：多行返回CASE WHEN

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