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Discuss content posted by D Sanborn
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Concatenation Cursor
44 posts, Page 2 of 5
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Concatenation Cursor
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crussell-931424
crussell-931424
Posted Tuesday, February 16, 2010 6:55 AM
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That is so cool. I love it.
Post #866070
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Tuesday, February 16, 2010 7:08 AM
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Juan de Dios (2/16/2010)
This script is very useful when all the rows are not NULL, but if you modify the insert of Mark with NULL, the script only returns Bill.
insert into @table values (4, NULL,'M')
Result: Bill
Where John goes???
Remember, in SQL, anything concat NULL = NULL,
therefore, when the NULL is encountered, the value is made NULL, then the next string is added. Since the definition is ISNULL(@var,''), the next value is added to the now empty string, delivering the last value
To cate for this, an aditional clause should be added to the predicate, viz:
AND Name IS NOT NULL
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #866082
tmacs33
tmacs33
Posted Tuesday, February 16, 2010 7:14 AM
SSC-Addicted
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Last Login: Wednesday, May 15, 2013 8:16 AM
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Nice question. I guessed at the answer but lucked out.
I already have a use for this in a couple of procedures today. PERFECT TIMING!!
Post #866090
Lawrence M. Meklemburg
Lawrence M. Meklemburg
Posted Tuesday, February 16, 2010 7:15 AM
SSC Eights!
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As a couple of comments stated, the names may not come back in the order you want. On the same server, I ran this query at different times and got "John, Mark, Bill", "John, Bill, Mark" and "Bill, John, Mark" .
Post #866093
bitbucket-25253
bitbucket-25253
Posted Tuesday, February 16, 2010 7:40 AM
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Juan de Dios (2/16/2010)
--------------------------------------------------------------------------------
This script is very useful when all the rows are not NULL, but if you modify the insert of Mark with NULL, the script only returns Bill.
insert into @table values (4, NULL,'M')
Result: Bill
Where John goes???
stewartc-708166
To cate for this, an aditional clause should be added to the predicate, viz:
AND Name IS NOT NULL
In addition or an alternative to stewartc excellent suggestion, you can in effect negate the presence of the NULL by using an ORDER BY [name] clause
More interesting try the code with a BLANK name, without the ORDER BY clause it appears in the list of names as
, ,
- with the ORDER BY clause it appears as a leading comma before Bill.
sanbornd
An EXCELLENT QOD thanks for devising it and submitting, may I encourage you to submit additional QODs
If everything seems to be going well, you have obviously overlooked something.
Ron
Please help us, help you -before posting a question please
read
Before posting a performance problem please
read
Post #866118
dun
dun
Posted Tuesday, February 16, 2010 8:25 AM
Mr or Mrs. 500
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Here's another alternative using STUFF and FOR XML PATH that does not require a parameter (I believe this is from an article from SSC. If I could have found the URL I would have included it in this post in order to give the appropriate credit.)
SELECT STUFF((SELECT ', ' + name
FROM @table
WHERE gender = 'M'
FOR XML PATH('')), 1, 2, '')
Post #866145
Tom Garth
Tom Garth
Posted Tuesday, February 16, 2010 8:48 AM
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A really good QotD! Thanks.
Tom Garth
Vertical Solutions
"There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." -- Will Rogers
Post #866162
SQLRNNR
SQLRNNR
Posted Tuesday, February 16, 2010 8:55 AM
SSCoach
Group: General Forum Members
Last Login: 2 days ago @ 1:46 PM
Points: 18,732,
Visits: 12,329
Nice question indeed. Thanks for submitting it.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #866166
brad.green
brad.green
Posted Tuesday, February 16, 2010 10:53 AM
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In addition to the comment about the missing order by, the result of this is also dependent on the CONCAT_NULL_YIELDS_NULL option. If this option is OFF, the argument to IsNull() will NOT be null, and therefore the result would be: ", John, Mark, Bill" -- leading comma.
Post #866253
KevinC.
KevinC.
Posted Tuesday, February 16, 2010 11:35 AM
Right there with Babe
Group: General Forum Members
Last Login: Tuesday, December 07, 2010 12:55 AM
Points: 771,
Visits: 504
Excellent question.
And thanks all for the additional information in your posts.
--
Kevin C.
Post #866279
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