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Editorial Team
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Asked: 2026-05-18T06:34:05+00:00

select top 1 col1 from table1 order by CreatedOn desc This query takes 6

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select top 1 col1 
from table1 
order by CreatedOn desc

This query takes 6 minutes on SQL Server 2005 to execute.

The table contains about 25,00,000 rows and number of total columns is 36, but as shown above I am just retrieving a single column whose datatype is uniqueidentifier.

So, please help me out on optimization and do let me know if any more details are required.

Well, let me tell you that I cannot change my table structure or cannot do any changes to table like index, etc. Suggest changes to query only or changes which won’t have an impact on table structure.

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1 Answer

  1. Editorial Team

    Are u test it :

    SELECT col1
FROM   table1
WHERE CreatedOn in (SELECT MAX(CreatedOn) AS col1 FROM table1)
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