Vous pouvez utiliser ce qui suit qui applique un row_number() aux enregistrements :
select DateTimeID,
[1] as Wavelength1,
[2] as Wavelength2,
SensorId
from
(
select [DateTimeID], [Wavelength], [SensorID],
row_number() over(partition by DateTimeID, SensorId
order by DateTimeID) rn
from yourtable
) src
pivot
(
max(Wavelength)
for rn in ([1], [2])
) piv
Voir SQL Fiddle avec démo .
Si vous aurez un nombre inconnu de wavelength valeurs, vous pouvez utiliser SQL dynamique pour générer ceci :
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX)
select @cols = STUFF((SELECT distinct ',' + QUOTENAME('Wavelength'+cast(rn as varchar(50)))
from
(
select row_number() over(partition by DateTimeID, SensorId
order by DateTimeID) rn
from yourtable
) src
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = 'SELECT DateTimeID,' + @cols + ', SensorId from
(
select [DateTimeID], [Wavelength], [SensorID],
''Wavelength''+cast(row_number() over(partition by DateTimeID, SensorId
order by DateTimeID) as varchar(50)) rn
from yourtable
) x
pivot
(
max(Wavelength)
for rn in (' + @cols + ')
) p '
execute(@query)
Voir SQL Fiddle avec démo
