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Issue with top and order by

Posted By:      Posted Date: November 16, 2010    Points: 0   Category :Sql Server
 

I have two different queries in which the only difference is the order by clause. There result set is empty (no records returned). Query 1 runs completes immediately, but Query 2 take 1:06 to complete. Any ideas on why adding the order by clause results in this type of performance penalty?

Thanks, Mike

 

QUERY 1:

select cp.* 

from tblcourseregistration cr 

inner join tblcourseposition cp on cr.sitememberid = 77434 and cr.courseregistrationid = cp.courseregistrationid 

order by cp.coursepositionid desc

 

QUERY 2:

select top 1 cp.* 

from tblcourseregistration cr 

inner join tblcourseposition cp on cr.sitememberid = 77434 and cr.courseregistrationid = cp.courseregistrationid 

order by cp.coursepositionid desc




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