Query to merge table rows into new columns

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Query to merge table rows into new columns

Author

Topic

cornall
Posting Yak Master

148 Posts

Posted - 2007-04-25 : 11:07:05

How do i do the following :-


indexA indexB  firstName   surname
  1       1      Dave       Davison
  1       2      John       Johnson
  2       1      Bob        Robertson
  2       2      James      Jameson

to

indexA firstName1 surname1 firstname2 surname2
   1     Dave     Davison    John     Johnson
   2     Bob      Robertson  James    Jameson

If there was 3 resords for indexA I would want to create columns firstName3 and surname3

Hope this makes sense!

cornall
Posting Yak Master

148 Posts

Posted - 2007-04-25 : 11:26:09

A little more info i always want 8 lots of the columns if there is only 2 indexB records for a given indexA then the other 6 have NULL values


indexA firstName1 surname1 firstname2 surname2 firstname3 surname3 firstname4 surname4 firstname5  ........
1        Dave     Davison    John     Johnson    NULL       NULL      NULL      NULL      NULL

jsmith8858
Dr. Cross Join

7423 Posts

Posted - 2007-04-25 : 11:56:53

This is usually easier to transform at your presentation layer, but if you must do it in T-SQL, you can do something like this:


select indexA, 
   max(case when indexB=1 then firstname end) as firstname1,
   max(case when indexB=1 then surName end) as surName1,
   max(case when indexB=2 then firstname end) as firstname2,
   max(case when indexB=2 then surName end) as surName2,
   .. 
   etc
   ..
from yourtable
group by indexA

- Jeff
http://weblogs.sqlteam.com/JeffS

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