CODEWITHSUNDEEP
t-sqlrowunpivotcross-apply
Hell-1931
Hell-1931

Reputation: 499

Columns to Rows in T-SQL

I have table tbl_Survey:

      SurveyID 1  2  3  4

            7  4  4  4  4
            8  3  3  3  3
            9  2  2  2  2

My goal is to transfer table headers - 1 2 3 4 into rows, as the following:

enter 
      SurveyID  Ouestion Rating

             7        1       4
             7        2       4
             7        3       4
             7        4       4
             8        1       3
             8        2       3
             8        3       3
             8        4       3
             9        1       2
             9        2       2
             9        3       2
             9        4       2

My code is (trying to follow help recommendations):

     SELECT [SurveyID]
           ,[Question]
           ,[Rating]
  
     FROM 
         [tbl_Survey]
         cross apply
                   (
                    values
                          ('1', 1 ),
                          ('2', 2 ),
                          ('3', 3 ),
                          ('4', 4 )
                   ) c (Question, Rating);

Results are not fully correct (Rating column is a problem):

         SurveyID  Ouestion Rating

             7        1       1
             7        2       2
             7        3       3
             7        4       4
             8        1       1
             8        2       2
             8        3       3
             8        4       4
             9        1       1
             9        2       2
             9        3       3
             9        4       4

Please, help...

My problem (because of which I couldn't proceed) was that I haven't used brackets for my code.

Here is the updated code for this:

          SELECT [SurveyID], [Question], [Rating]

          FROM [dbo].[tbl_Survey]

              UNPIVOT
              (
               [Rating]
                
                FOR [Question] in ([1], [2], [3], [4])
               
               ) AS SurveyUnpivot

Upvotes: 0

Views: 54

Answers (2)

drj99
drj99

Reputation: 11

Same approach. Just make sure you use a global temporary table as a temp table will not be visible in the scope of the EXEC statement. This should work with any column name and any number of columns.

IF OBJECT_ID('tempdb..##T') IS NOT NULL DROP TABLE ##T
CREATE TABLE ##T (SurveyID int, xxxxx int, yyyyy int, zzzzzz int, tttttt int) 
INSERT ##T VALUES (7,4,4,4,4), (8,3,3,3,3), (9, 2, 2, 2, 2)

DECLARE @Colnames nvarchar(4000)
SELECT @Colnames = STUFF((SELECT ',[' + [name] +']' FROM tempdb.sys.columns where object_id = object_id('tempdb..##T') AND name <> 'SurveyID' FOR XML PATH('') ),1,1,'')

DECLARE @SQL nvarchar(4000)  SET @SQL = 'SELECT SurveyID, Question, Rating FROM ##T UNPIVOT (Rating FOR Question in ('+@colnames+')) as UPV'
EXEC(@SQL)

Upvotes: 0

drj99
drj99

Reputation: 11

How about this:

DECLARE @T TABLE (SurveyID int, q1 int, q2 int,  q3 int, q4 int) 
INSERT @T (SurveyID, q1, q2, q3, q4) 
VALUES (7,4,4,4,4), (8,3,3,3,3), (9, 2, 2, 2, 2)

SELECT SurveyID, REPLACE(Question,'q','') as Question, Rating 
FROM @T UNPIVOT (Rating FOR Question in (q1, q2, q3, q4)) as UPV

Upvotes: 1

Related Questions