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Understanding the OVER clause


Understanding the OVER clause

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WayneS
WayneS
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Comments posted to this topic are about the item Understanding the OVER clause

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,
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henn
henn
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some remarks

1. V11 (Azure) don't support OVER (ORDER BY) in Aggretates

2. the NEXT VALUE with OVER is interesting things to play

I'd like to persist current rank over order by some attribute. Unfortunately OVER isn't supported in UPDATE and MERGE. But there is workoround



-- use NOrthwind -- Smile

-- /*
create sequence nr as int start with 1
-- */ alter sequence nr restart with 1
go

alter table products add x int
go

update products
set x = t.n
from products p
join (select productid, next value for nr over (order by unitprice) n from products) T
on p.productid = t.productid
go

select * from products
go
alter table products drop column x
drop sequence nr



with bests
Henn
LDK
LDK
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James and Cynthia must be some pretty epic DBA's @ $3000\hr Smile
Nice article. thank you.
Felix Pamittan
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Great explanation particularly on the RANGE and ROWS clause. Thanks very much for this.




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Michael Lysons
Michael Lysons
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Excellent article - thank you.
BobMcClellan
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Excellent Article! Thanks for posting this. We always find a way to query what we need.
This will allow ( for me at least ) to be a bit more surgical. I use row_number() frequently but
was unaware of all the other uses for OVER as well as ROWS & RANGE. Moving forward, I know this will cut down on the lines of code needed... replacing sub queries or CTE's I'd previously use to get different aggregate values.

Thanks again,
Bob.
Anthony peiris
Anthony peiris
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Fantastic article.. thanks
Mike Good
Mike Good
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Great article.



RonKyle
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Thanks for taking the time to write this. Took me way beyond what I've done with the OVER function.



pilab72
pilab72
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Is there any stairway about analytics functions?
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