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

In Oracle this will do the job,

select a.member,a.number,b.newcol from table a,(select member,replace(wm_concat(number),',','.') newcol from test11 group by member)b where a.member=b.member;