Du måste definiera en GROUP BY
och använd MAX
samla för att få den utdata du vill ha:
SELECT listup.NodeNumber As Node, listup.Station As Extension,
MAX(CASE WHEN VoiceServer = 1 THEN KeyDescription ELSE NULL END) AS 'Key1',
MAX(CASE WHEN VoiceServer = 2 THEN KeyDescription ELSE NULL END) AS 'Key2',
MAX(CASE WHEN VoiceServer = 3 THEN KeyDescription ELSE NULL END) AS 'Key3',
MAX(CASE WHEN VoiceServer = 4 THEN KeyDescription ELSE NULL END) AS 'Key4',
MAX(CASE WHEN VoiceServer = 5 THEN KeyDescription ELSE NULL END) AS 'Key5',
MAX(CASE WHEN VoiceServer = 6 THEN KeyDescription ELSE NULL END) AS 'Key6',
MAX(CASE WHEN VoiceServer = 7 THEN KeyDescription ELSE NULL END) AS 'Key7',
MAX(CASE WHEN VoiceServer = 8 THEN KeyDescription ELSE NULL END) AS 'Key8',
MAX(CASE WHEN VoiceServer = 9 THEN KeyDescription ELSE NULL END) AS 'Key9',
MAX(CASE WHEN VoiceServer = 10 THEN KeyDescription ELSE NULL END) AS 'Key10'
FROM listup
GROUP BY listup.NodeNumber As Node, listup.Station As Extension
ORDER BY listup.NodeNumber, listup.Station
NULL
är att föredra framför en nolllängd sträng.