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datetime => how to have complete date with 00:00:00.000 Expand / Collapse
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Posted Wednesday, December 02, 2009 1:49 AM
Grasshopper

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Hi,

i work with sql server 2005 and i 'm a beginner
I have a table with a column datetime.

in this table i have some date as this :

2008-10-28 11:04:04.207
2009-03-30 13:26:10.433
2009-01-16 14:06:20.033

but i'd like when i do a query select * from myTable to have the date in format

2008-10-28 00:00:00.000
2009-03-30 00:00:00.000
2009-01-16 00:00:00.000

How i can do this !?

Thanks in advance
Christophe
Post #827249
Posted Wednesday, December 02, 2009 1:57 AM
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A number of ways of doing this:

SELECT CONVERT(datetime,CONVERT(char(8),MyDateTimeColumn,112))
FROM MyTable

or

SELECT CONVERT(datetime,DATEDIFF(DD,0,MyDateTimeColumn))
FROM MyTable

Hope that helps.

Mike
Post #827252
Posted Wednesday, December 02, 2009 1:59 AM
Ten Centuries

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One way I often do this:

CREATE TABLE #MyTable
(
MyDate DATETIME
)

INSERT INTO #MyTable
SELECT '2008-10-28 11:04:04.207' UNION ALL
SELECT '2009-03-30 13:26:10.433' UNION ALL
SELECT '2009-01-16 14:06:20.033'

SELECT MyDate,
DATEADD(dd, DATEDIFF(dd, 0, MyDate), 0) MyDate_DateOnly
FROM #MyTable

DROP TABLE #MyTable


Hope this helps.

Cheers,
Simon
Post #827254
Posted Wednesday, December 02, 2009 2:25 AM
Grasshopper

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Hi both,

thanks for your sample, it's ok now !

thanks for your time
christophe
Post #827266
Posted Wednesday, December 02, 2009 9:29 AM


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Here is a link to some common date routines:
http://www.sqlservercentral.com/blogs/lynnpettis/archive/2009/03/25/some-common-date-routines.aspx

CEWII
Post #827619
Posted Wednesday, December 02, 2009 7:41 PM


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Be a bit careful about using character conversions of dates, folks. They're s-l-o-w. Might not make any difference with just a couple of thousand rows but if you work with millions of rows, it can really add up in a hurry.

--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

"Change is inevitable. Change for the better is not." -- 04 August 2013
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Post #827891
Posted Thursday, April 07, 2011 9:20 AM


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Jeff, what do you suggest as a best-practice for returning a date with 00:00:00.000?

______________________________________________________________________________
"Never argue with an idiot; They'll drag you down to their level and beat you with experience"
Post #1089997
Posted Thursday, April 07, 2011 2:57 PM


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Either of the following is what I consider to be a "best practice". They're both very fast but the first one edges out the second when it comes to millions of rows if you need to apply it to something that large.
 SELECT CAST(DATEDIFF(dd,0,GETDATE()) AS DATETIME),
DATEADD(dd,DATEDIFF(dd,0,GETDATE()),0)

Replace the GETDATE() with whatever date you may have including dates in a column from a table. Just don't forget to add the FROM clause for the table.


--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

"Change is inevitable. Change for the better is not." -- 04 August 2013
(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013

Helpful Links:
How to post code problems
How to post performance problems
Post #1090254
Posted Friday, April 08, 2011 5:02 AM


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You may find this useful too:

http://www.simple-talk.com/sql/learn-sql-server/robyn-pages-sql-server-datetime-workbench/


--
Nigel
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Posted Friday, April 08, 2011 8:02 AM


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Jeff Moden (4/7/2011)
Either of the following is what I consider to be a "best practice". They're both very fast but the first one edges out the second when it comes to millions of rows if you need to apply it to something that large.
 SELECT CAST(DATEDIFF(dd,0,GETDATE()) AS DATETIME),
DATEADD(dd,DATEDIFF(dd,0,GETDATE()),0)

Replace the GETDATE() with whatever date you may have including dates in a column from a table. Just don't forget to add the FROM clause for the table.


Ah... I just had a horrible thought based on how the original question was posed. If you're trying to use such a thing as criteria for a JOIN or a WHERE clause, DO NOT use either of the two methods above on the COLUMN of a TABLE. Instead, do this...

 SELECT something
FROM SomeTable
WHERE SomeDateColumn >= SomeWholeDate
AND SomeDateColumn < DATEADD(dd,1,SomeWholeDate)


The code above finds all the rows in SomeTable that have a date (with or without time) that falls on SomeWholeDate and it does so while still allowing an index on SomeDateColumn to be used. Using just about any formula on SomeDateColumn itself will prevent the use of an index.


--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

"Change is inevitable. Change for the better is not." -- 04 August 2013
(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013

Helpful Links:
How to post code problems
How to post performance problems
Post #1090651
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