get the third record from the suquery

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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LVL 19
erikTsomikSystem Architect, CF programmer Asked:
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Russ SuterCommented:
Use a subquery

  [OrderDate] DESC
) as [TopOrders]
  [TopOrders].[OrderDate] ASC

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Anthony PerkinsCommented:
Any chance you can post the complete query?
Vitor MontalvãoMSSQL Senior EngineerCommented:
erikTsomik, the full query can help us to give you a solution for your question.
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Query Syntax

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