Re: Converting SQL Server Top N to Oracle Equivalent

That is correct, though the order by rownum is redundant as you only have one row. If you have a recent version of oracle then you might also wish to check out the analytic functions as well.

On 10/23/08, mkb <mkb125_at_yahoo.com> wrote:
> Hi,
>
> Gota SS2K5 query that I'm trying to convert over to Oracle 10gR2.
>
> This is the SS2K5 query:
>
> select top 1 ALG.time_stamp
> from ALG, CHG
> where ALG.change_id = CHG.id
> and (type = 'CL' or type = 'RE')
> order by ALG.time_stamp ASC
>
> I coded the Oracle 10gR2 equivalent as follows:
>
> select b.time_stamp
> from (
> select alg.time_stamp
> from ALG, CHG
> where ALG.change_id = CHG.id
> and (type = 'CL' or type = 'RE')
> order by ALG.time_stamp asc) b
> where rownum <= 1
> order by rownum asc
> /
>
> Is this the correct way to do it? I wish I could check the results between
> the SS2K5 db and the Oracle db but I don't have access to the SS db and even
> if I did, the data sets are very different.
>
> Anyway, just wanted to know if I was on the right track or am I totally
> off-base here.
>
> tia
>
> --
> mohammed
>
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

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Niall Litchfield
Oracle DBA
http://www.orawin.info
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