sql - datetime variable versus string representation of datetime variable

Posted by BhejaFry on Stack Overflow See other posts from Stack Overflow or by BhejaFry
Published on 2010-05-06T03:52:44Z Indexed on 2010/05/06 3:58 UTC
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sql

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datetime

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string

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date

Hi folks,

I have a query that takes too long to respond when the search parameter happens to be a varchar datatype with date. However, if i convert varchar to datetime variable, the query runs fine.

For ex:

This takes too long.

select count(id) from names where updateddate > '1/5/2010'

This runs fine.

declare @dateparam datetime

set @dateparam = convert(datetime, '1/5/2010',102)

select count(id) from names where updateddate > @dateparam

What's the reason one runs fine but the other doesn't?

TIA

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