Grouping column data with common value or else show default text

Question

I want to achieve the following transformation:

Sample Data

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

Result:

NumWURm ReportAText       ReportBText   ReportCText ReportDText ReportEText ReportFText

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

Desired Output

I want to to get the common column values to be shown as it is, in case the values differ, I want to show some default text.

NumWURm ReportAText      ReportBText    ReportCText ReportDText   ReportEText   ReportFText

3       Report On venue  Warm Up        Photo       Default Text        

Answer 1

This is just the case for my favourite MIN = MAX trick. When MIN and MAX are the same, then there's only one value, and either the MIN or the MAX can be used as THE value.

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)

If you need this to be really specific, you may need to specify a collation option for the string comparison (eg if case difference is significant to you).

Answer 2

The following would produce a single row of output for a non-empty set.

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)

This is a code outline and so will require suitable testing and adjustment.