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Hugo Kornelis SSC Guru Points: 64790 More actions · Answer 1

Jeff Moden (12/28/2014)
The link for the "poor documentation" that I was speaking of is actually in Books Online under UPDATE... as in "Quirky Update", which can be controlled but is absolutely not supported. Let's not go there, though. 😀

I see the similarities between quirky update and aggregate concatenation queries from an "intenedced effect" point of view, but frmo a technical point of view, they are totally different. I don't think it's safe to assume that documentation for the one applies to the other.

Hugo Kornelis, SQL Server/Data Platform MVP (2006-2016)
Visit my SQL Server blog: https://sqlserverfast.com/blog/
SQL Server Execution Plan Reference: https://sqlserverfast.com/epr/

Jeff Moden SSC Guru Points: 1004419 More actions · Answer 2

Hugo Kornelis (12/28/2014)
Jeff Moden (12/28/2014)
The link for the "poor documentation" that I was speaking of is actually in Books Online under UPDATE... as in "Quirky Update", which can be controlled but is absolutely not supported. Let's not go there, though. 😀
I see the similarities between quirky update and aggregate concatenation queries from an "intenedced effect" point of view, but frmo a technical point of view, they are totally different. I don't think it's safe to assume that documentation for the one applies to the other.

That would be part of the reason why I have so much fun at all of this. I don't assume but I do see the similarities and the possible workarounds.

--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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

manik_anu SSCrazy Points: 2377 More actions · Answer 3

Very simple question. i got 1 :w00t:

Manik
You cannot get to the top by sitting on your bottom.

Wayne West SSC-Insane Points: 22586 More actions · Answer 4

DrKiller (12/23/2014)
wow what a complex way of doing it.
I'm usually just doing this 🙂
DECLARE @tmpString VARCHAR(MAX)
SELECT @tmpString = COALESCE(@tmpString + ', ' + productname, productname) FROM Header
SELECT @tmpString

Six years ago I was using this technique against an ERP POS that shall remain nameless: rather than use a memo field they had a table that chunked comments in to 50 character pieces and I used this technique to piece it back together through a function. In my case, I was selecting a very small number of records out of a large table, so hopefully it was doing RBAR on a small subset. We never had any performance problems in that install.

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[font="Arial"]Knowledge is of two kinds. We know a subject ourselves or we know where we can find information upon it. --Samuel Johnson[/font]

Andre Ranieri SSCrazy Points: 2819 More actions · Answer 5

This technique works well enough, I've used this in production code against SQL 2008 R2. However, not sure if this works in 2005 or prior versions.

Andre Ranieri

@sqlinseattle