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Converting datetime to shortdatetime

Posted on 2007-04-03
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I am trying to convert a date field so I can yes it in a query

Original data is CrDate with data type of datetime. 2007-04-02 23:00:15.397
I would like to convert it to smalldatetime so I can run queries against it i.e. WHERE (CrDate = '4/2/2007')

I see a function CONVERT ( data_type [ ( length ) ] , expression [ , style ] ), but I'm not sure what to substitute such as style.

Environment SQL Server 2000

I would appreciate any suggstions.  Thanks.  DC900

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Question by:dc900
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6 Comments
 
LVL 10

Accepted Solution

by:
lahousden earned 750 total points
ID: 18846135
Just as an aside - if the only reason for changing the type is for being able to find rows in the database then datetime will work pretty much the same as smalldatetime.  I.e. If none of your Invoices were created at exactly midnight, then

select *
from Invoices
where created = '4/1/2007'

will find no rows whether created is datetime or smalldatetime.  The "gotcha" for new SQL developers is to query by range, e.g.

select *
from Invoices
where created >= '4/1/2007' and created < '4/2/2007'

will find all the Invoices for 4/1/2007.
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LVL 10

Assisted Solution

by:lahousden
lahousden earned 750 total points
ID: 18846158
Incidentally, if you still feel you want to change the type then you can use Enterprise Manager to change the column type in the table - it will complain about losing information but you can choose to ignore this and go ahead with the change.
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LVL 5

Assisted Solution

by:nakul_vachhrajani
nakul_vachhrajani earned 300 total points
ID: 18846159
I believe that even without conversion, your query should perform fine enough.
Even then if you are using stored procedures, you can try using SET DATEFORMAT (Refer SQL BOL for more details on this)
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LVL 35

Assisted Solution

by:YZlat
YZlat earned 150 total points
ID: 18846414
SELECT CONVERT(VARCHAR(10), datetimefield, 101) AS formatted_date
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LVL 19

Assisted Solution

by:folderol
folderol earned 300 total points
ID: 18846588
Datetime is stored in SQL as a float value, the integer portion is days and the fractional portion is time. To strip off the time from a datetime value, you only need to convert it to an integer, the following are all popular formulas for doing this.  Copy / paste these lines to Query Analyzer to see the results.

select
-- returns string
convert(char(10),getdate(),101),  
-- returns datetime
convert(datetime,convert(char(10),getdate(),101)),
cast(datediff(day,0,getdate()) as datetime),
cast(floor(cast(getdate() as float)) as datetime)

Tom
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Expert Comment

by:mkennon
ID: 23537112
YZlat's Comment is the correct solution.
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