SQL server compare multiple columns and display text when two values match -


i have table multiple columns identifying body area injured:

id      head    face    thor   abdo    spine   area injured 4721    5       0       5      3       0       multiple  4723    0       0       0      3       3       multiple 4737    0       0       1      3       0       abdo 4752    0       2       0      0       0       face

at present, [area injured] column based on column contains highest value, if 2 columns have joint highest value, lists 'multiple'.

i want change [area injured] column , list actual body areas instead of 'multiple', example:

id      head    face    thor   abdo    spine   area injured 4721    5       0       5      3       0       head, thor    4723    0       0       0      3       3       abdo, spine 4737    0       0       1      3       0       abdo 4752    0       2       0      0       0       face

how compare 5 columns establish columns have highest values?

one way use case expressions find columns largest value:

sql fiddle

select *,     [area injured] =         stuff((             case when head >= face , head >= thor , head >= abdo , head >= spine ', head' else '' end +             case when face >= head , face >= thor , face >= abdo , face >= spine ', face' else '' end +             case when thor >= head , thor >= face , thor >= abdo , thor >= spine ', thor' else '' end +             case when abdo >= head , abdo >= face , abdo >= thor , abdo >= spine ', abdo' else '' end +             case when spine >= head , spine >= face , spine >= abdo , spine >= thor ', spine' else '' end         ), 1, 2, '') tbl

another way, more dynamic, unpivot data , use rank column highest value. then, use for xml path('') concatenation:

sql fiddle

with cteunpivot as(     select         t.id, x.col, x.value     tbl t     cross apply(values         ('head', t.head),         ('face', t.face),         ('thor', t.thor),         ('abdo', t.abdo),         ('spine', t.spine)     )x(col, value) ), ctern as(     select *,         rn = rank() over(partition id order value desc)     cteunpivot ) select      c.id,     [area injured] =         stuff((             select ', ' + col             ctern                             id = c.id                 , rn = 1             xml path('')         ),1 ,2, '') ctern c group c.id

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