"Select TOP " question

I ran two query: one with order by, one does not.
Note that a clustered index has been build on column
DCN, CO_cd. No index on Sta_Rsn_Cd.
1) select top 1 DCN, CO_Cd, Dept from tblTest
where Dept = '212' and Sta_Rsn_Cd <> 'TRN' and Sta_Rsn_Cd <> 'NDF'
and Sufx = 'C'
and check_out <> 'Y'
order by Sta_Rsn_Cd
2) select top 1 DCN, CO_Cd, Dept from tblTest
where Dept = '212' and Sta_Rsn_Cd <> 'TRN' and Sta_Rsn_Cd <> 'NDF'
and Sufx = 'C'
and check_out <> 'Y'
In BOL
"If a SELECT statement that includes TOP also has an ORDER BY clause,
the rows to be returned are selected from the ordered result set. The
entire result set is built in the specified order and the top n rows in
the ordered result set are returned."
It seems that 2) would run faster than 1). When I run,
1) is faster than 2). I use SQL 2000. Any comments?
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It's hard to say from this. Can you run the SHOWPLAN for each of these
commands and include that here as well.
Rick Sawtell
"YB" <yb@.dex.com> wrote in message
news:eidd8xPoEHA.2948@.TK2MSFTNGP11.phx.gbl...
> I ran two query: one with order by, one does not.
> Note that a clustered index has been build on column
> DCN, CO_cd. No index on Sta_Rsn_Cd.
> 1) select top 1 DCN, CO_Cd, Dept from tblTest
> where Dept = '212' and Sta_Rsn_Cd <> 'TRN' and Sta_Rsn_Cd <> 'NDF'
> and Sufx = 'C'
> and check_out <> 'Y'
> order by Sta_Rsn_Cd
> 2) select top 1 DCN, CO_Cd, Dept from tblTest
> where Dept = '212' and Sta_Rsn_Cd <> 'TRN' and Sta_Rsn_Cd <> 'NDF'
> and Sufx = 'C'
> and check_out <> 'Y'
> In BOL
> "If a SELECT statement that includes TOP also has an ORDER BY clause,
> the rows to be returned are selected from the ordered result set. The
> entire result set is built in the specified order and the top n rows in
> the ordered result set are returned."
> It seems that 2) would run faster than 1). When I run,
> 1) is faster than 2). I use SQL 2000. Any comments?
>
> *** Sent via Developersdex http://www.codecomments.com ***
> Don't just participate in USENET...get rewarded for it!