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The OVER Clause enhancements in SQL Server code named “Denali”, CTP3


The OVER Clause enhancements in SQL Server code named “Denali”, CTP3

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WayneS
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Jeff Moden (8/25/2011)
Great article, Wayne, although I'm a bit surprised you didn't publish the million row performance findings (like you did on your blog) which shows just how big a performance and "reads" problem you can run into with this new functionality.

Still, the new functionality will beat a cursor.


Thanks Jeff,

The editor already had me remove some significant sections to keep it simple for the join-challenged amongst us... wanted to keep this article about just the enhancements to the over clause, and not really go beyond that.

Plus, it gave me a way to promote the blog when the running totals came up in the discussion thread. :-D

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

Ken Wymore
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Wayne - Any chance those edited sections will appear in a future article?
WayneS
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Kenneth Wymore (8/25/2011)
Wayne - Any chance those edited sections will appear in a future article?

Always a chance, and it would give me an opportunity to expand upon it also.

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

Jeff Moden
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WayneS (8/25/2011)
Jeff Moden (8/25/2011)
Great article, Wayne, although I'm a bit surprised you didn't publish the million row performance findings (like you did on your blog) which shows just how big a performance and "reads" problem you can run into with this new functionality.

Still, the new functionality will beat a cursor.


Thanks Jeff,

The editor already had me remove some significant sections to keep it simple for the join-challenged amongst us... wanted to keep this article about just the enhancements to the over clause, and not really go beyond that.

Plus, it gave me a way to promote the blog when the running totals came up in the discussion thread. :-D


BWAA-HAAA!!! Editors... what do they know? :-P (Hi Steve!)

Understood on all fronts. Thanks for the feedback, Wayne. And, I'll say it again, well done on the article and the blog both! :-)

--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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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TheSQLGuru
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Wayne, can you please email me a link to your blog with the perf testing of the Denali OVER enhancements? I did a web search but couldn't find it. TIA!

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Kevin G. Boles
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Wayne,

Excellent examples and a solid walkthrough, thank you.

Btw, for your question about real-use of range, you'd have to wrap the results in a distinct.

I'm thinking of log-entries. If you want by day-running totals, you'd do a by range and then distinct the results on the summed columns and the leading identifiers. This way if 2 ppl worked on a project 1 day and 10 people the next you could still have 2 rows, one identifying each day after the distinct with the correct totals.


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WayneS
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TheSQLGuru (8/25/2011)
Wayne, can you please email me a link to your blog with the perf testing of the Denali OVER enhancements? I did a web search but couldn't find it. TIA!


Hi Kevin,

I guess you missed it up above, in my reply to Jack. Anyway, it's http://blog.waynesheffield.com/wayne/archive/2011/08/running-totals-in-denali-ctp3/ (it was disguised as my blog post).
(Or, you could click the little blue "Blog" button below any of my posts here on SSC. ;-) )

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

WayneS
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Kenneth, Revenant, Jason, Andre, UMG, Craig:

Thanks for your positive feedback, and I'm very glad that you liked the article.

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

Goldie Lesser
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Awesome article! Easy to read and very informative.
I especially liked that you provided simple easy-to-understand examples. :-)
WayneS
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Goldie Lesser (8/26/2011)
Awesome article! Easy to read and very informative.
I especially liked that you provided simple easy-to-understand examples. :-)


Thanks Goldie. I try to provide easy to understand examples to aid people in seeing how something they currently have can be easily adapted.

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

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