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Asked: 2026-06-01T08:38:35+00:00

I have a Datetime column called CreatedOn in a table. CreatedOn is also part

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I have a Datetime column called CreatedOn in a table. CreatedOn is also part of a non-clustered index where the order is descending.

Previously in the where condition I had a condition as follows

WHERE DateDiff(d,CreatedOn,GetDate()) < 180 AND ... other conditions

I changed this to 

WHERE CreatedOn > '2012-04-04 00:00:00.000' AND ... other conditions

where I am calculating the cutoff date in C# code and then putting that in the adhoc query.

According to me, the second condition should be faster but I do not yet see a significant change in query execution times. But as the size of the table grows, which one will run faster?

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1 Answer

  1. Editorial Team

    The second form.

    Putting functions on columns invalidates use of indexes (in almost all cases, so simply follow this rule always). See “Ten Common SQL Programming Mistakes”, number 2

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