DateTime data types

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DateTime data types

Pulivarthi Sasidhar

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April 10, 2013 at 11:03 pm

#272928

Comments posted to this topic are about the item DateTime data types

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Vinay Kumar SSCertifiable Points: 6099 More actions · Answer 1

Thanks for start my day with an easy question.

Still i found result as "Correct answers: 100%"

Nice question, keep it up my friend !!!

🙂

Thanks
Vinay Kumar
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Keep Learning - Keep Growing !!!

kapil_kk SSC-Insane Points: 21316 More actions · Answer 2

Really good question 🙂

+1

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To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/

Primo Dang SSCrazy Points: 2643 More actions · Answer 3

Got it right by elimination. There is no way a NULL value would be converted to an actual date (as far as I know, at least), so that eliminates answer B. Date types can't return an empty string (that would have to be char, varchar, etc.), so that eliminates answer A.

However, I never memorized the date that is equivalent to 0 and I didn't know if datetime, datetime2 and date had different conversions from integers, so if there had been an answer such as NULL, 1900-01-01 00:00:000, 1753-01-01 00:00:000, 1900-01-01, I might had gotten it wrong. Guess I learned that much from this question, then.

Thanks, Sasidhar Pulivarthi! 😀

Edit: changed "don't know if datetime (...) have different conversions from integers" to "didn't know", which made me realized I actually learned something new here. :w00t:

jlennartz SSCommitted Points: 1574 More actions · Answer 4

If default values are returned as in your explaination why are not all the values except null returned in this format, "1900-01-01 00:00:00.0000000". How did they get switched to "Jan 1 1900 12:00AM"?

SQLRNNR SSC Guru Points: 281334 More actions · Answer 5

Thanks

Jason...AKA CirqueDeSQLeil
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demonfox SSCertifiable Points: 6289 More actions · Answer 6

Primo Dang (4/11/2013)
Got it right by elimination
Thanks, Sasidhar Pulivarthi! 😀

+1

Thanks for the question ..

~ demonfox
___________________________________________________________________
Wondering what I would do next , when I am done with this one :ermm:

demonfox SSCertifiable Points: 6289 More actions · Answer 7

jlennartz (4/11/2013)
If default values are returned as in your explaination why are not all the values except null returned in this format, "1900-01-01 00:00:00.0000000". How did they get switched to "Jan 1 1900 12:00AM"?

the default conversion style for cast and convert is 0 for datetime and 121 for datetime2 ; that's how !!

ref: http://msdn.microsoft.com/en-gb/library/ms187928.aspx

~ demonfox
___________________________________________________________________
Wondering what I would do next , when I am done with this one :ermm:

manik_anu SSCrazy Points: 2377 More actions · Answer 8

Primo Dang (4/11/2013)
Got it right by elimination. There is no way a NULL value would be converted to an actual date (as far as I know, at least), so that eliminates answer B. Date types can't return an empty string (that would have to be char, varchar, etc.), so that eliminates answer A.
However, I never memorized the date that is equivalent to 0 and I didn't know if datetime, datetime2 and date had different conversions from integers, so if there had been an answer such as NULL, 1900-01-01 00:00:000, 1753-01-01 00:00:000, 1900-01-01, I might had gotten it wrong. Guess I learned that much from this question, then.
Thanks, Sasidhar Pulivarthi! 😀
Edit: changed "don't know if datetime (...) have different conversions from integers" to "didn't know", which made me realized I actually learned something new here. :w00t:

i too memorize if we use datatime2 datatype that gives the datetime value as '1900-01-01 00:00:00.0000000 '. That is the reason to clicked the third answer... it's correct.....

thanks for this question.. nice one....

Manik
You cannot get to the top by sitting on your bottom.

jlennartz SSCommitted Points: 1574 More actions · Answer 9

demonfox (4/11/2013)
jlennartz (4/11/2013)
If default values are returned as in your explaination why are not all the values except null returned in this format, "1900-01-01 00:00:00.0000000". How did they get switched to "Jan 1 1900 12:00AM"?
the default conversion style for cast and convert is 0 for datetime and 121 for datetime2 ; that's how !!
ref: http://msdn.microsoft.com/en-gb/library/ms187928.aspx

Thank You

Hardy21 SSCrazy Eights Points: 9708 More actions · Answer 10

demonfox (4/11/2013)
Primo Dang (4/11/2013)
Got it right by elimination
Thanks, Sasidhar Pulivarthi! 😀
+1
Thanks for the question ..

+1

Thanks

David Conn SSCertifiable Points: 6010 More actions · Answer 11

What I find annoying is that by assigning a value of '' to the Datetime2 variable is that it has gone for '1900........'

My preference would be to set the variable to its lowest possible value which is '0001-01-01..........'

I guess that Microsoft has gone for consistency ?

David

PChiragS SSCarpal Tunnel Points: 4965 More actions · Answer 12

PChiragS

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Points: 4965

April 12, 2013 at 8:06 pm

#1606223

+1..

Thanks for the question..

Koen Verbeeck SSC Guru Points: 259115 More actions · Answer 13

Thanks for the question.

Need an answer? No, you need a question
My blog at https://sqlkover.com.
MCSE Business Intelligence - Microsoft Data Platform MVP

SqlOnMyMind SSCertifiable Points: 5062 More actions · Answer 14

David Conn (4/12/2013)
What I find annoying is that by assigning a value of '' to the Datetime2 variable is that it has gone for '1900........'
My preference would be to set the variable to its lowest possible value which is '0001-01-01..........'
I guess that Microsoft has gone for consistency ?
David

The default value is equivalent to zero, at least for the older datatypes, DateTime and SmallDateTime, and zero is defined to be 1900-01-01. Older dates are therefore "negative numbers". I tried to modify the question to set the 4 variables = 0, but learned that this is not allowed for the newer DateTime2 and Date datatypes (even with an explicit conversion) (at least, in SQL 2008).

Msg 529, Level 16, State 2, Line 6

Explicit conversion from data type numeric to date is not allowed.

So, to demonstrate the zeros, I ended up with:

Declare @smldatetime SmallDateTime

, @dt DateTime

, @dt2 DateTime2

, @d Date

Select

@d=''

, @smldatetime=0

, @dt=0

, @dt2 =''

Select

CAST(@d as varchar)

, CAST(@smldatetime as VARCHAR)

, CAST(@dt as VARCHAR)

, CONVERT(varchar,@dt2 )