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transpose rows

Posted on 2012-04-02
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Last Modified: 2012-04-20
Hi,
I have table which looks like

table1
wc_id email
101    aa@yahoo.com
101    bb@yahoo.com
102    cc@yahoo.com
203    dd@yahoo.com

i want the results as
wc_id email
101    aa@yahoo.com;bb@yahoo.com
102    cc@yahoo.com
203    dd@yahoo.com

Thanks
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Question by:sam2929
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2 Comments
 
LVL 45

Expert Comment

by:Kent Olsen
ID: 37797250
Hi Sam,

This kind of question comes up quite a bit.  :)   I can be solved pretty easily with a function, stored procedure, recursive query, or sometimes just a simple join.

Quick question.  Is there a limit on how many email addresses that can be assigned to any wc_id value?  If it's one and there is a primary (or unique) key, a simple join is probably the easiest.  If the limit is more than 1, recursive SQL is worth trying, and if there can be "a lot", you'll need to determine if you want to continue lines or put "a lot" of email addresses on one line.


Kent
0
 
LVL 18

Accepted Solution

by:
Dave Ford earned 500 total points
ID: 37797268
The following example should show you how to do it pretty simply. Adapt as you see fit.

HTH,
DaveSlash

select *
  from rec

SNUM         WORDNUM   WORD   
   1               1   This   
   1               2   is     
   1               3   a      
   1               4   fine   
   1               5   example
   2               1   Yet    
   2               2   another
   2               3   example
   2               4   blah1  
   2               5   blah2  
   2               6   blah3  

WITH rquery (snum, wordnum, sentence) as (
 SELECT base.snum, base.wordnum, base.word
    FROM rec base
   WHERE wordnum = 1

  UNION ALL

  SELECT t1.snum, t1.wordnum, sentence || ' ' || t1.word
    FROM rquery t0
    join rec t1
      on t0. snum = t1. snum
     AND t0.wordnum + 1 = t1.wordnum
)
select r1.SNUM,
       r1.SENTENCE
  from rquery r1             
 where r1.wordnum = (        
       select max(r2.wordnum)
       from rquery r2         
      where r2.snum = r1.snum)

SNUM   SENTENCE                             
   1   This is a fine example               
   2   Yet another example blah1 blah2 blah3

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