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Combine data from many rows into single row

Posted on 2012-04-12
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Last Modified: 2012-06-27
I have a master table called tbl_Job in which I want to populate a 4000char string, by pulling info from the child table tbl_JobBOM.  There can be up to 99 records in tbl_JobBOM from which several columns need extracted and placed into the parent table in a single row, single column, per PK.


WITH CTE AS 
(
SELECT 
    ItemNo + ' ' +QtyRequired) + ' ' + QtyOpen +  CHAR(13) + CHAR(10) 
  AS CompDetails, 
  
  ROW_NUMBER() OVER (PARTITION BY JobOper ORDER BY ItemNo) AS Seq,
    JobOper FROM tbl_JobBOM 
)  
    
UPDATE b SET ComponentsThisOper = 
LEFT( 
+ (SELECT MAX(CompDetails) FROM CTE WHERE JobOper=b.JobOper AND Seq=1) 
+ (SELECT MAX(CompDetails) FROM CTE WHERE JobOper=b.JobOper AND Seq=2) 
+ (SELECT MAX(CompDetails) FROM CTE WHERE JobOper=b.JobOper AND Seq=3) 
+ (SELECT MAX(CompDetails) FROM CTE WHERE JobOper=b.JobOper AND Seq=4) 
--... 
+ (SELECT MAX(CompDetails) FROM CTE WHERE JobOper=b.JobOper AND Seq=97) 
+ (SELECT MAX(CompDetails) FROM CTE WHERE JobOper=b.JobOper AND Seq=98) 
+ (SELECT MAX(CompDetails) FROM CTE WHERE JobOper=b.JobOper AND Seq=99)
,4000) 

FROM tbl_Job b

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The tables are large and the query takes 2 minutes to run.  I'm looking for a better way to do this, that runs much faster and doesn't require the 99 lines of select statements.

Can someone please send a working code snippet to illustrate a better approach?

 I have searched all over Google and have read about pivots, coalesce, etc but am not able to understand how to apply the concepts to this problem.

Thanks in advance
0
Comment
Question by:LovinSpoonful
  • 3
4 Comments
 
LVL 37

Expert Comment

by:momi_sabag
ID: 37840578
try this
WITH CTE AS
(
SELECT
    ItemNo + ' ' +QtyRequired) + ' ' + QtyOpen +  CHAR(13) + CHAR(10)
  AS CompDetails,
 
  ROW_NUMBER() OVER (PARTITION BY JobOper ORDER BY ItemNo) AS Seq,
    JobOper FROM tbl_JobBOM
) ,
cte2 (CompDetails) as (
select CompDetails   from cte where seq between 1 and 99 order by seq for xml path('')
  )
UPDATE b SET ComponentsThisOper =
LEFT( CompDetails,4000)

FROM tbl_Job b
0
 

Author Comment

by:LovinSpoonful
ID: 37849766
I am not able to make this work.

Here is what I can make work:


WITH a AS (
SELECT JobOper,
       ItemNo + ' ' + CONVERT(VARCHAR,QtyRequired) + ' ' + CONVERT(VARCHAR,QtyOpen) +  CHAR(13) + CHAR(10) AS CompDetails,
       ROW_NUMBER() OVER (PARTITION BY JobOper ORDER BY ItemNo) AS Seq
FROM tbl_JobBOM
)  

SELECT CompDetails FROM a WHERE a.Seq between 1 and 99
  and JobOper = '623417.150'
ORDER BY seq FOR XML PATH('')

result:

<CompDetails>abcdef  6 0
</CompDetails>
<CompDetails>ghijklm 3 0
</CompDetails>
<CompDetails>nopqrs 3 0
</CompDetails>


I need to get the JobOper attached to each XML record, then update with a join.
I tried this but it doesn't work:


WITH a AS (
SELECT JobOper,
       ItemNo + ' ' + CONVERT(VARCHAR,QtyRequired) + ' ' + CONVERT(VARCHAR,QtyOpen) +  CHAR(13) + CHAR(10) AS CompDetails,
       ROW_NUMBER() OVER (PARTITION BY JobOper ORDER BY ItemNo) AS Seq
FROM tbl_JobBOM
)  

, b (JobOper, CompDetails) AS (SELECT JobOper, CompDetails FROM a WHERE a.Seq between 1 and 99 ORDER BY seq FOR XML PATH(''))

UPDATE j SET ComponentsThisOper = LEFT(b.CompDetails,4000)
FROM tbl_Job j
INNER JOIN b ON j.JobOper = b.JobOper
WHERE j.JobOper = b.JobOper


the error is:  
Msg 8159, Level 16, State 1, Line 9
'b' has fewer columns than were specified in the column list.
0
 

Accepted Solution

by:
LovinSpoonful earned 0 total points
ID: 38084070
The way this was eventually solved was to create an additional table to post the intermediary data into, the run a second update query.  then we deleted the temporary table.
0
 

Author Closing Comment

by:LovinSpoonful
ID: 38097725
didn't get an answer from the community
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