algo como esto:
Código SQL:
Ver originalCREATE TABLE #temp
(
campo TIME
)
INSERT INTO #temp VALUES ('00:01:00')
INSERT INTO #temp VALUES ('00:02:00')
INSERT INTO #temp VALUES ('00:03:00')
SELECT DATEADD(ms, SUM(DATEDIFF(ms, '00:00:00.000', campo)), '00:00:00.000') FROM #temp
saludos!