spli two rows

[pele]

I have result some query:

id_lokal; persons
  44      person44
  45      person45
  [B]46      person46
  46      person160[/B]
  47      person47
  48      person48

I would like have

44      person44
  45      person45
 [B] 46      person46,person160[/B]
  47      person47
  48      person48

How to do this ?