CODEWITHSUNDEEP
sqlsql-serverpivot
perplexedDev
perplexedDev

Reputation: 835

Convert Rows to column rows in SQL Server

I am looking for a way to convert the rows in a table to columns rows and assign column names for each.

Players Id  Team
john    1   t1
carmel  1   t1
jack    1   t1
james   1   t1

Changed to:

Id  Team  p1    p2      p3      p4
1   t1    john  carmel  jack    james

There can be any number of players in the above example. I tried using pivot. I could change the rows to columns but not in the fashion I am looking for.

Upvotes: 0

Views: 110

Answers (1)

Felix Pamittan
Felix Pamittan

Reputation: 31879

Here is one way using dynamic crosstab. Read this article by Jeff Moden for more details.

DECLARE @sql1 VARCHAR(4000) = ''
DECLARE @sql2 VARCHAR(4000) = ''
DECLARE @sql3 VARCHAR(4000) = ''

SELECT @sql1 =
'SELECT 
    Id
    , Team
'

SELECT @sql2 = @sql2 +
'   , MAX(CASE WHEN RN = ' + CONVERT(VARCHAR(10), RN) + ' THEN Players END) AS ['  + CONVERT(VARCHAR(10), RN) + ']' + CHAR(10)
FROM(
    SELECT DISTINCT
        RN = ROW_NUMBER() OVER(PARTITION BY Id, Team ORDER BY (SELECT NULL))
    FROM Tbl
)t
ORDER BY RN

SELECT @sql3 =
'FROM(
    SELECT *,
        RN = ROW_NUMBER() OVER(PARTITION BY Id, Team ORDER BY (SELECT NULL))
    FROM Tbl
)t
GROUP BY
Id, Team'

PRINT (@sql1 + @sql2 + @sql3)
EXEC (@sql1 + @sql2 + @sql3)

SQL Fiddle

Upvotes: 3

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