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Editorial Team
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Asked: 2026-06-17T03:23:19+00:00

I have a query: SELECT ROW_NUMBER() OVER(ORDER BY LogId) AS RowNum FROM [Log] l

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I have a query:

SELECT ROW_NUMBER() OVER(ORDER BY LogId) AS RowNum 
FROM [Log] l
where RowNum = 1

and I’m getting the following error:

Invalid column name ‘RowNum’.

I did some search here and found that column aliasing is not available in WHERE.

so I tried the the following and it worked:

select * 
from 
(
     SELECT ROW_NUMBER() OVER(ORDER BY LogId) AS RowNum 
     FROM [Log] l
) as t
where t.RowNum = 1

Is there a better way, from performance point of view, to make this query?

Thanks in advance.

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1 Answer

  1. Editorial Team

    That’s just the way it is.

    Column aliases can not be used on the same logical level where they were defined. You will have to use the derived table (sub-query) as you have found out.

    If you are concerned about performance, then don’t. The derived table is mere syntactical sugar, it won’t make the query slower (compared to the solution you tried first).

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