Coalescing values in a column over a partition

Question

I have chosen to ask this question via an example as I think it most clearly illustrates what I am trying to do.

Say I have the following table:

mem         


        

Answer 1

depending on your version of db2, the LISTAGG() function may be available to you. i think it is included in any db2 version after 9.7.

example:

select
  member,
  number,
  listagg(number,',') as new_column
from
  tablename
group by
  member