• listagg function in 11g release 2
  Adrian Billington teaches listagg function with examples, GROUP BY , comparison of alternates to listagg, including WM_CONCAT and CAST with COLLECT
  in Oracle > DB 11g with billington collect group listagg partition stragg within wm_concat
• ORACLE-BASE
  String Aggregation Techniques
  in Oracle with aggregation concat listagg string techniques wm_concat

wm_concat from all users