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VB.Net - Query Date Field Disregarding Time in DateTime Field

Posted on 2014-09-07
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Last Modified: 2014-09-07
Hello Experts!

I am having some trouble with Select query.  I am trying to compare a date against a SQL table field that has DateTime.
I have values 3/19/2012 12:54:32 PM in the field but the User is just entering 3/19/2012 in the textbox.

How can I disregard the time and just match on the 3/19/2012?

Thanks for the help,
jimbo99999
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Question by:Jimbo99999
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Expert Comment

by:becraig
ID: 40309041
I am assuming here that you are taking the value back from a html form field and performing the query against the DB

If so simply cast the input:
(SELECT CAST(FLOOR(CAST( 3/19/2012 AS float)) AS datetime))
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by:Jimbo99999
ID: 40309053
Hello There becraig:

I apologize here I was not clear in my description.  This is just a VB.Net windows app and I am just grabbing the User input from a textbox.
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becraig earned 2000 total points
ID: 40309071
Ok so you still have to change this in your code.

Either converting the string from the textbox to date-time
http://www.dotnetperls.com/datetime-parse-vbnet

or convert on the sql side the actual datetime from the db to date part
http://sqlhints.com/2013/07/14/how-to-get-date-part-only-from-datetime-in-sql-server/
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Author Comment

by:Jimbo99999
ID: 40309100
Thanks for the links...very informative...it is working now!

jimbo99999
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Expert Comment

by:PortletPaul
ID: 40309126
sorry for lateness - I was called away - but hope you don't mind the following

there is a complete alternative approach: do not change the data, change the method of filtering

http://en.wikipedia.org/wiki/Sargable

Rules of thumb
Avoid applying functions on data values in a sql condition.
Avoid non-sargable predicates and replace them with sargable equivalents.

>>"I have values 3/19/2012 12:54:32 PM in the field but the User is just entering 3/19/2012"
in your case, there is a single date (but many rows of data)

where that_field >= '20120319' and that_field < dateadd(day,1,'20120319')

and you get the results you need, but avoid lots of unnecessary calculations on the data and ensure the query can access indexes on that_field too

---------
if you do have to change the data, the second reference above gives some inefficient methods, these are generally the best:
SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE())) -- returns datetime
SELECT CONVERT (DATE, GETDATE()) -- returns date

, or the equivalent using cast:
SELECT CAST (GETDATE() AS DATE) -- returns date
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