ms sql pivot does not work - sql-server

Question

I'm trying to transpose a simple table from rows to columns with two string variables. I went trough several examples from the web without success. The number of rows will vary so I need to transpose the table dynamically. The following code at least does not produce an error but does not generate the result!
The sample table
create table #Encabezado
(
NodeName nvarchar(100),
NodeValue nvarchar(100)
)
INSERT INTO #Encabezado (NodeName, NodeValue) VALUES
('RUTEmisor','88888888-8'),
('RznSoc','EMPRESA DE PRUEBA'),
('GiroEmis','Informatica'),
('Acteco','1'),
('CdgSIISucur','59529595'),
('DirOrigen','Teatinos 120'),
('CmnaOrigen','Santiago'),
('CiudadOrigen','Santiago')
GO
The unpivot code
DECLARE #colsUnpivot AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #colsUnpivot
= stuff((select ','+quotename(C.column_name)
from information_schema.columns as C
where C.table_name = '#Encabezado' and
C.column_name like '%Name'
for xml path('')), 1, 1, '')
set #query
= 'select NodeName,
Nodevalue
from #Encabezado
unpivot
(
NodeName
for NodeName in ('+ #colsunpivot +')
) u'
exec sp_executesql #query;
Any help would be appreciated

Answer 1

Sequelspear once said : "To Pivot or UnPivot, That's the question."
declare #cols NVARCHAR(MAX) = stuff((select ','+quotename(Nodename) from #Encabezado group by Nodename for xml path('')),1,1,'');
declare #query NVARCHAR(MAX) = 'select * from #Encabezado pivot (max(NodeValue) for NodeName IN ('+ #cols +')) pvt';
exec sp_executesql #query;

Answer 2

To Dynamically Pivot
Declare#Cols AS NVARCHAR(MAX),#SQL AS NVARCHAR(MAX);
Set #Cols = Stuff((Select Distinct ',' + QuoteName(NodeName)
From #Encabezado
For XML Path(''), Type
).value('.', 'varchar(max)'),1,1,'')
Set #SQL = 'Select * From #Encabezado
Pivot (
max(NodeValue)
For [NodeName] in (' + #Cols + ')
) p '
Exec (#SQL)
Returns
Now, to unpivot, consider the following:
Declare #User table (ID int,Active bit,First_Name varchar(50),Last_Name varchar(50),EMail varchar(50))
Insert into #User values
(1,1,'John','Smith','john.smith#email.com'),
(2,0,'Jane','Doe' ,'jane.doe#email.com')
Declare #XML xml = (Select * from #User for XML RAW)
Select ID = r.value('#ID','int')
,Active = r.value('#Active','bit')
,Item = attr.value('local-name(.)','varchar(100)')
,Value = attr.value('.','varchar(max)')
From #XML.nodes('/row') as A(r)
Cross Apply A.r.nodes('./#*') AS B(attr)
Where attr.value('local-name(.)','varchar(100)') not in ('ID','Active')
Returns