Ashok Gupta Ashok Gupta - 2 months ago 8
SQL Question

Need to Pivot String values in SQL server

I have table described as:

Occupation String |
Name String


With values:

Developer | A
Developer | B
Designer | X
Coder | Y
Coder | Z


I need values in pivot format as:

Designer | Developer | Coder
---------+-----------+--------
X | A | Y
Null | B | Z


Can anyone help on this ?

Thanks in advance

Answer

The basic PIVOT with ROW_NUMBER() will do things for you:

SELECT  [Developer],
        [Designer],
        [Coder]
FROM (
    SELECT  *,
            ROW_NUMBER() OVER (PARTITION BY Occupation ORDER BY (SELECT NULL)) RN
    FROM #temp
) as t
PIVOT (
    MAX(Name) FOR Occupation IN ([Developer],[Designer],[Coder])
) as pvt

Output:

Developer   Designer    Coder
A           X           Y
B           NULL        Z

If the number of Occupations may very then you need dynamic SQL:

DECLARE @columns nvarchar(max),
        @sql nvarchar(max)

SELECT @columns = (
    SELECT DISTINCT ','+QUOTENAME(Occupation)
    FROM #temp
    FOR XML PATH('')
)

SELECT @sql = N'
SELECT  '+STUFF(@columns,1,1,'')+'
FROM (
    SELECT  *,
            ROW_NUMBER() OVER (PARTITION BY Occupation ORDER BY (SELECT NULL)) RN
    FROM #temp
) as t
PIVOT (
    MAX(Name) FOR Occupation IN ('+STUFF(@columns,1,1,'')+')
) as pvt'

EXEC sp_executesql @sql

Note: I have used ORDER BY (SELECT NULL) just to get some random ordering. Better use some actual field for this purpose.