Question

我想实现以下转型：

示例数据

SELECT NumWURm,ReportAText,ReportBText,ReportCText,ReportDText,ReportEText,ReportFText 
FROM t_SchFacility 
WHERE  FacID IN (483,485)

结果：

NumWURm ReportAText       ReportBText   ReportCText ReportDText ReportEText ReportFText

3       Report On venue   Warm Up       Photo       Get Set     
2       Report On venue   Warm Up       Photo

所需输出

我想让公共列值按原样显示，如果值不同，我想显示一些默认文本。

NumWURm ReportAText      ReportBText    ReportCText ReportDText   ReportEText   ReportFText

3       Report On venue  Warm Up        Photo       Default Text

Answer 1

这就是我最喜欢的MIN = MAX技巧。当MIN和MAX相同时，只有一个值，MIN或MAX可用作THE值。

SELECT     
    MAX(NumWURm) as NumWURm,
    CASE WHEN MIN(ReportAText) = MAX(ReportAText) 
        THEN MIN(ReportAText)
        ELSE 'Default'
    END,
    CASE WHEN MIN(ReportBText) = MAX(ReportBText) 
        THEN MIN(ReportBText)
        ELSE 'Default'
    END,
    CASE WHEN MIN(ReportCText) = MAX(ReportCText) 
        THEN MIN(ReportCText)
        ELSE 'Default'
    END,
    CASE WHEN MIN(ReportDText) = MAX(ReportDText) 
        THEN MIN(ReportDText)
        ELSE 'Default'
    END,
    CASE WHEN MIN(ReportEText) = MAX(ReportEText) 
        THEN MIN(ReportEText)
        ELSE 'Default'
    END,
    CASE WHEN MIN(ReportFText) = MAX(ReportFText) 
        THEN MIN(ReportFText)
        ELSE 'Default'
    END
FROM t_SchFacility 
WHERE  FacID IN (483,485)

如果您需要确实特定，则可能需要为字符串比较指定一个排序规则选项（例如，如果案件差异对您很重要）。

Answer 2

以下将为非空集生成单行输出。

with [Selected] ([NumWURm], [ReportAText], [ReportBText], [ReportCText], [ReportDText], [ReportEText], [ReportFText])
(
    select [NumWURm], [ReportAText], [ReportBText], [ReportCText], [ReportDText], [ReportEText], [ReportFText]
    from [t_SchFacility]
    where [FacID] IN (483, 485)
),
  [Number_Selected] ([count])
(
    selected count(*)
    from [Selected]
),
  [ReportAText] ([ReportAText])
(
    select s.[ReportAText], n.[count]
    from [Selected] as s cross join [Number_Selected] as n
    group by s.[ReportAText], n.[count]
    having count(*) = n.[count]
),
...
  [ReportFText] ([ReportFText])
(
    select s.[ReportFText], n.[count]
    from [Selected] as s cross join [Number_Selected] as n
    group by s.[ReportFText], n.[count]
    having count(*) = n.[count]
)
select
    max(s.[NumWURm]) as 'NumWuRm',
    a.coalesce([ReportAText], 'Default Text') as 'ReportAText',
    b.[ReportBText] as 'ReportBText',
    c.[ReportCText] as 'ReportCText',
    d.[ReportDText] as 'ReportDText',
    e.[ReportEText] as 'ReportEText',
    f.[ReportFText] as 'ReportFText'
from
    [Selected] as s
        left outer join
    [ReportAText] as a
        on (null is null)
        left outer join
    ...
    [ReportFText] as f
        on (null is null)

这是代码大纲，因此需要进行适当的测试和调整。

使用公共值对列数据进行分组，或者显示默认文本

2 个答案: