Finding New Years Eve

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Finding New Years Eve

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L' Eomot Inversé

Posted Tuesday, January 01, 2013 8:08 AM

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That's quite a mess, isn't it!

The only correct answer is "none of the above", for two reasons:

1) none of the select statements is syntactically valid.
2) even when the missing parentheses are added to make them syntactically valid, none of them will return 31.12.2012 on 31st Jan 2013 because February doesn't have 31 days this year.

If you want a select statement that does what is sepcified, the simple approach is

select dateadd(day,-datepart(day,GETDATE()),GETDATE())

edit: I see Hugo posted a better method with only one getdate() call and returning a date without any time.

Tom
Is minic a gheibheann béal oscailte dorn dúnta.
Is minig a cheapas beul fosgailte dòrn dùinte.

Post #1401604

sknox

Posted Tuesday, January 01, 2013 8:40 AM

Ten Centuries

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L' Eomot Inversé (1/1/2013)

select dateadd(day,-datepart(day,GETDATE()),GETDATE())

edit: I see Hugo posted a better method with only one getdate() call and returning a date without any time.

Came to post this same thing, and saw that you and Hugo had already caught it. Darn you time zones!!!

...because February doesn't have 31 days this year.

In Steve's defense, perhaps this code was originally written in a year where February did have 31 days...?
Tongue

Post #1401607

Lon-860191

Posted Tuesday, January 01, 2013 8:44 AM

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Regardless, Happy New Year to all.

Post #1401608

Thomas Abraham

Posted Tuesday, January 01, 2013 8:52 AM

Ten Centuries

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You've all missed the biggest error - besides the parenthesis and February issues. This question is listed in category "humor", and isn't one bit funny! Smile

Happy New Year!

Please don't go. The drones need you. They look up to you.

Post #1401610

Vera-428803

Posted Tuesday, January 01, 2013 1:03 PM

Say Hey Kid

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Happy New Year Smile

concerning the QoTD: none of the syntax will work because of missing parenthesis. But hey, it's a good laugh and that's what this catergory is about.

Post #1401620

Steve Jones - SSC Editor

Posted Tuesday, January 01, 2013 5:11 PM

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Parens corrected, and my apologies. I changed to question to exclude Jan 31, this that doesn't work.

Happy New Year.

I'll award back points tomorrow.

Follow me on Twitter: @way0utwest

Forum Etiquette: How to post data/code on a forum to get the best help

Post #1401633

Michael Valentine Jones

Posted Tuesday, January 01, 2013 6:50 PM

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I think this method with the nested DATEADD/DATEDIFF is simple and has the advantage of eliminating the time part.


select
	a.DT,
	[LastDayOfPriorMonth] =
		dateadd(mm,datediff(mm,-1,a.DT)-1,-1),
	[LastDayOfPriorYear]  =
		dateadd(yy,datediff(yy,-1,a.DT)-1,-1)
from
	( -- Test Dates
	select top 32
		DT = getdate()-1+
		row_number() over (order by object_id)
	from sys.objects
	) a
order by
	a.DT

Results:

DT                      LastDayOfPriorMonth     LastDayOfPriorYear
----------------------- ----------------------- -----------------------
2013-01-01 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-02 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-03 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-04 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-05 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-06 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-07 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-08 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-09 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-10 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-11 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-12 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-13 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-14 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-15 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-16 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-17 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-18 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-19 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-20 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-21 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-22 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-23 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-24 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-25 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-26 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-27 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-28 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-29 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-30 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-01-31 20:47:27.733 2012-12-31 00:00:00.000 2012-12-31 00:00:00.000
2013-02-01 20:47:27.733 2013-01-31 00:00:00.000 2012-12-31 00:00:00.000