SQL Server pivot using case statement

Question

I\'m trying to pivot out some data and I think I need to incorporate a case statement in my pivot code but I\'m not sure how. I have the table below:

ID              


        

Answer 1

You need to use aggregate on top of case statements

SELECT id,
       Max(CASE
             WHEN LEFT(areaID, 1) = 1 THEN 'Yes'
           END) Head,
       Max(CASE
             WHEN LEFT(areaID, 1) = 2 THEN 'Yes'
           END) Face,
       Max(CASE
             WHEN LEFT(areaID, 1) = 3 THEN 'Yes'
           END) Neck,
       Max(CASE
             WHEN LEFT(areaID, 1) = 4 THEN 'Yes'
           END) Abdo
FROM   #testcase
GROUP  BY id 

Answer 2

You could use a real PIVOT solution instead like this:

DECLARE @t table(ID int, AreaCode int)
INSERT @t 
VALUES
  (1001,1501),(1001,1502),(1001,2301),(1031,1010),
  (1031,3012),(1048,2304),(1048,3012),(1048,4022)

SELECT id, [1]Head, [2]Face, [3]Neck, [4]Abdo
FROM  
( 
  SELECT id, left(AreaCode, 1) Area, 'Yes' x
  FROM @t
) p 
PIVOT (Max(x) FOR [Area] IN ([1],[2],[3],[4])) AS pvt 

Result:

id    Head  Face  Neck  Abdo
1001  Yes   Yes   NULL  NULL
1031  Yes   NULL  Yes   NULL
1048  NULL  Yes   Yes   Yes