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Asked: 2026-05-10T22:53:06+00:00

I’ve been doing a convert(varchar,datefield,112) on each date field that I’m using in ‘between’

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I’ve been doing a convert(varchar,datefield,112) on each date field that I’m using in ‘between’ queries in SQL server to ensure that I’m only accounting for dates and not missing any based on the time part of datetime fields.

Now, I’m hearing that the converts aren’t indexable and that there are better methods, in SQL Server 2005, to compare the date part of datetimes in a query to determine if dates fall in a range.

What is the optimal, indexable, method of doing something like this:

select * from appointments where appointmentDate>='08-01-2008' and appointmentDate<'08-15-2008'
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  1. Converting numeric types to string values (a type of Boxing) is not the best performing method of doing what you are looking for. Its not really about index-able, because the actual column type is date time.

    If you are looking for the best way query for dates, then your example is right, but you may want to take into account the 3 ms precision difference in MSSQL. It can mean that records from one day can show up in another day’s result.

    This 

    select * from appointments where appointmentDate>='08-01-2008' and appointmentDate<'08-15-2008'

    Should be this

    select * from appointments where appointmentDate>='08-01-2008' and appointmentDate<='08-14-2008 23:59:59.996'
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