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What is the Syntax for a COALESCE inside a DATEDIFF statement?

Last Modified: 2010-04-21
I have a DATEDIFF statement that I want to use a COALESCE in instead of a CASE.

For Example:

,datediff(day, case oh.OrderStatus
       when 'QS' then oh.OrderAPPRejDate
         when 'SH' then oh.OrderShippedDate
         when 'PS' then oh.OrderPODate
         when 'IP' then case when oh.ConfirmDate is not null then oh.ConfirmDate    
                                         else oh.OrderAPPRejDate  end
         when 'SB' then COALESCE (oh.OrderAPPRejDate, last_oar.OrderApprRtDate,  
         else last_oar.OrderApprRtDate      
                     end, NOW()) as Days_Waiting

This syntax creates an error but it demonstrates what I would like to do. What would the proper syntax be? If I can't do a COALESCE I could do another CASE statement.

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