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November 24, 2014 at 10:59 am

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Marcia J SSCertifiable Points: 5649 More actions · Answer 1

Koen Verbeeck (11/24/2014)
Nice question. I have been bitten by the windowing functions defaults before, so this question was easy 😀
(I even wrote a blog post about it: Beware the defaults! (in windowing functions)[/url]. Shameless plug :-). Somehow it didn't make it to the explanation :hehe:)

Thanks for the article. It was very helpful.

Marcia J SSCertifiable Points: 5649 More actions · Answer 2

TomThomson (11/24/2014)
Nice question, but I have two queries about it:
(i) why 2 points? it's just extremely simple logic.
(ii) why use first_value and DESC when last_value would do, so that the code could be 6 characters (including the space before DESC) shorter?

See the article that Koen linked in his first reply. It gives a very good explanation.

akljfhnlaflkj SSC Guru Points: 76202 More actions · Answer 3

Thanks for the question. Though I'm not on 2012, the correct answer seemed like the logical choice.

Thomas Abraham SSChampion Points: 10761 More actions · Answer 4

Thanks for the question. Seemed easy enough, but was sufficiently challenging for a Monday.

Saw Koen's plug for his blog. Can we get him to rewrite BOL too?

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Koen Verbeeck SSC Guru Points: 259085 More actions · Answer 5

Stewart "Arturius" Campbell (11/24/2014)
Thomas Abraham (11/24/2014)
Thanks for the question. Seemed easy enough, but was sufficiently challenging for a Monday.
Saw Koen's plug for his blog. Can we get him to rewrite BOL too?
Now that is a good idea...

I'll send my hourly rate to Microsoft! 😎

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My blog at https://sqlkover.com.
MCSE Business Intelligence - Microsoft Data Platform MVP

Ed Wagner SSC Guru Points: 287024 More actions · Answer 6

Koen Verbeeck (11/24/2014)
Stewart "Arturius" Campbell (11/24/2014)
Thomas Abraham (11/24/2014)
Thanks for the question. Seemed easy enough, but was sufficiently challenging for a Monday.
Saw Koen's plug for his blog. Can we get him to rewrite BOL too?
Now that is a good idea...
I'll send my hourly rate to Microsoft! 😎

I'm sure you'll get an enthusiastic response. 😉

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TomThomson SSC Guru Points: 104773 More actions · Answer 7

marcia.j.wilson (11/24/2014)
TomThomson (11/24/2014)
Nice question, but I have two queries about it:
(i) why 2 points? it's just extremely simple logic.
(ii) why use first_value and DESC when last_value would do, so that the code could be 6 characters (including the space before DESC) shorter?
See the article that Koen linked in his first reply. It gives a very good explanation.

Yes, a good article.

I would say that this is a severe case of badly chosen defaults, but that's nothing unusual, I guess. I would have expected the default to be all rows in the partition, as someone else said. This question and discussion have saved me from finding out the hard way than the default is quite different.

Tom

Koen Verbeeck SSC Guru Points: 259085 More actions · Answer 8

TomThomson (11/28/2014)
marcia.j.wilson (11/24/2014)
TomThomson (11/24/2014)
Nice question, but I have two queries about it:
(i) why 2 points? it's just extremely simple logic.
(ii) why use first_value and DESC when last_value would do, so that the code could be 6 characters (including the space before DESC) shorter?
See the article that Koen linked in his first reply. It gives a very good explanation.
Yes, a good article.

Thanks for the kind words. :blush:

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