Question

I am getting data in the following format from a sql table:

DisplayName     PropertySystemName     PropertyDefaultName     PropertyValue
S1                  P1                    Property 1              Value 1
S1                  P2                    Property 2              Value 2
S1                  P3                    Property 3              Value 3
S1                  P4                    Property 4              Value 4
S1                  P5                    Property 5              Value 5
S1                  P6                    Property 6              Value 6
S1                  P7                    Property 7              Value 7
S1                  P8                    Property 8              Value 8
S1                  P9                    Property 9              Value 9
S1                  P10                   Property 10             Value 10

This is the desired output:

DisplayName   Property 1   Property 2 Property 3
S1               Value 1     Value 2    Value 3

This is the query i have but it does not produce the desired output.

Select me.DisplayName,
     Min(Case PropertySystemName When 'P1' Then PropertyValue End) PropertyDefaultName,
     Min(Case PropertySystemName When 'P2' Then PropertyValue End) PropertyDefaultName,
     Min(Case PropertySystemName When 'P3' Then PropertyValue End) PropertyDefaultName
FROM vManagedEntity me

This is the output of above query:

DisplayName   PropertyDefaultName   PropertyDefaultName PropertyDefaultName
S1               Value 1                   Value 2           Value 3

How do i modify the query in order to produce the desired output without hard coding the Column Header as it is already present in the table.

Answer 1

You cannot use the value from the PropertyDefaultName column as a column header unless you use dynamic sql. Using Dynamic SQL will allow you to pull the column values and the header names directly from the tables:

DECLARE @cols AS NVARCHAR(MAX),
    @colNames AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX)

select @cols = STUFF((SELECT distinct ',' + QUOTENAME(PropertySystemName) 
                    from vManagedEntity
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

select @colNames = STUFF((SELECT ',' + QUOTENAME(PropertySystemName) 
                          + ' as '+ replace(PropertyDefaultName, ' ', '')
                    from vManagedEntity
                    group by PropertySystemName, PropertyDefaultName
                    order by cast(replace(PropertySystemName, 'P', '') as int)
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query = 'SELECT DisplayName, ' + @colNames + ' from 
             (
                select DisplayName, PropertySystemName,
                   PropertyValue
                from vManagedEntity
            ) x
            pivot 
            (
                min(PropertyValue)
                for PropertySystemName in (' + @cols + ')
            ) p '

execute(@query)

See SQL Fiddle with demo

The result is:

| DISPLAYNAME | PROPERTY1 | PROPERTY2 | PROPERTY3 | PROPERTY4 | PROPERTY5 | PROPERTY6 | PROPERTY7 | PROPERTY8 | PROPERTY9 | PROPERTY10 |
----------------------------------------------------------------------------------------------------------------------------------------
|          S1 |   Value 1 |   Value 2 |   Value 3 |   Value 4 |   Value 5 |   Value 6 |   Value 7 |   Value 8 |   Value 9 |   Value 10 |