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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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Comments posted to this topic are about the item The OVER Clause enhancements in SQL Server code named “Denali”, CTP3

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
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madonl
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Will the enhanced Over clause also support *user defined* aggregate functions?
augustine.damba 67604
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Hi,

Could you please verify that the Select statement and the Over() is correct for
SumByRows and SumByRange?

The Over() function is using same parameters but the results are different.

I have not yet installed Denali so I cannot test this on my PC.
madonl
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I should have googled before posting my question, the answer is already out there. Denali doesn't support UDAs with the Over clause. Oh well.
Paul White
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madonl (8/24/2011)
I should have googled before posting my question, the answer is already out there. Denali doesn't support UDAs with the Over clause. Oh well.

You can vote for Bob's connect item here:

http://connect.microsoft.com/SQLServer/feedback/details/681155/windowing-enhancements-not-available-on-sqlclr-aggregates



Paul White
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WayneS
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augustine.damba 67604 (8/24/2011)
Hi,

Could you please verify that the Select statement and the Over() is correct for
SumByRows and SumByRange?

The Over() function is using same parameters but the results are different.

I have not yet installed Denali so I cannot test this on my PC.


Take a closer look... the parameters are not the same. The SumByRows is using "ROWS UNBOUNDED PRECEDING", and SumByRange is using "RANGE UNBOUNDED PRECEDING"

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

Jack Corbett
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Good article Wayne. Clear and concise examples. I'm looking forward to the running totals ability.



Jack Corbett

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Jack Corbett (8/25/2011)
Good article Wayne. Clear and concise examples.

Thanks Jack.

I'm looking forward to the running totals ability.

Then check out my blog post on it.

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

jcrawf02
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Nice job Wayne! So, assuming I understand this correctly, I can use the "Sliding Aggregations" to show a six-month trailing trend, or something similar?

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Nice blog post Wayne - shame the performance doesn't look great at the moment for a common use-case. Hope they sort it out before RTM - I don't recall the Oracle version having any huge performance hit on the windowing functions, so not sure there's a major architectural reason it has to have so many reads
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