I have the following table;
CREATE TABLE [x_Note] (
[x_NoteId] [int] IDENTITY (1, 1) NOT NULL ,
[Note] [varchar] (7200) COLLATE SQL_Latin1_Gene ral_Pref_CP1_CI _AS NOT
NULL ,
CONSTRAINT [PK_x_NoteId] PRIMARY KEY CLUSTERED
(
[x_NoteId],
) WITH FILLFACTOR = 90 ON [USERDATA] ,
) ON [USERDATA]
GO
My clients want me to take the contents of the Note column for each row
and combine them. In other words, they basically want:
Note = Note [accumulated from previous rows] + Char(13) [because they
want a carriage return] + Note [from current record].
What is the most efficient and relatively painless way to do this? I
think it might require a cursor, but I'm not sure if there is a more
elegant set-based method to make this happen.
Dec 5 '05
14  2415 
One more problem: there could be hundreds of categories, and we dont
know in advance how many categories there will be.
im************* ******@yahoo.co m wrote: One more problem: there could be hundreds of categories, and we dont
know in advance how many categories there will be.
What's the problem? With the script I posted you don't need to know the
number of categories. You do need to set some upper limit on the number
of notes for each category but given that the maximum size of a VARCHAR
is 8000 and that your note column is 7K characters that may not be a
problem either - the number of notes you can support with this or any
other SQL query is possibly quite small anyway.
If you want to concatente the notes to a TEXT / NTEXT column then I
think you really will have to use a cursor.
--
David Portas
SQL Server MVP
-- im************* ******@yahoo.co m (im************ *******@yahoo.c om) writes: Now, I have NO idea how to pull this off. I was considering nested
cursors, but I'm not sure if that is the best way, or even a practical
way. Help!!!
Before just posting "I can't do this, I can't do that", how about doing
some research. How long will these combined texts be? Since the notes
are declared as varchar(7200), one suspects that the total length may
exceed 8000 chars. But is it really so? What does:
SELECT NoteCategory, SUM(len(Note) + 1)
FROM x_Note
ORDER BY 2 DESC
return?
If there commonly are categories where the total length is > 8000, you
will have to run a cursor, and accumlate data into a new table, where
the concatenated note is written into a text column using the WRITETEXT
command. Quite painful. You don't need nested cursors though, your loop
only needs some logic to recognize that you have entered a new NoteCategory.
By the way, within each category, in which order are you supposed to
concatenate them? By x_NoteId? Are you sure that gives a correct result?
--
Erland Sommarskog, SQL Server MVP, es****@sommarsk og.se
Books Online for SQL Server 2005 at http://www.microsoft.com/technet/pro...ads/books.mspx
Books Online for SQL Server 2000 at http://www.microsoft.com/sql/prodinf...ons/books.mspx
That code was amazing! We are running tests now, but it looks like it
works very well with just minor adjustments. Thanks very much!!!
By the way, would books would you recommend for enhancing one's
knowledged of SQL programming in general?
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