SELECT t.*
FROM Table t
CROSS APPLY (
SELECT COUNT(1) AS Cnt
FROM Table
WHERE ADMITID = t.ADMITID
AND [DATETIME] > = DATEADD(ss,-10,t.[DATETIME])
AND [DATETIME] <= DATEADD(ss,10,t.[DATETIME]
)t1
WHERE Cnt >0
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SQL Server MVP
http://visakhm.blogspot.com/