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get the third record from the suquery

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Last Modified: 2015-03-31
I have the correlated subquery in the select statement and i need to get the third record. Right now I am getting it based on the unit number but it is wrong , I Need to get it based on the startDate

IsNull( (SELECT MAX(SU2.sessionstart) 
 FROM SessionUnit SU2 WITH (NOLOCK) WHERE SU2.sessionKey = SU.sessionkey AND [b]SU2.unitOrder = 3 [/b]) , NULL ) 
 AS purchaseenddate,

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