记得有这样一个函数，将多行合并成一行，总是记不住。

wmsys.wm_concat(field)

SQL> select * from t1;
         ID NAME                                   FID
----------- ------------------------------ -----------
          1 aaaa                                     0
          2 bbbb                                    11
          3 cccc                                     0
          4 dddd                                     1
          5 eeee                                     1
          6 66666                                    2
          7 7777                                     2
          8 8888                                     3
          9 9999                                     2
         10 HHHHH                                    6
         11 KKKKK                                    6
         13 asdasfafsa                              12
12 rows selected

SQL> select fid,wmsys.wm_concat(name) as name_str from t1 group by fid;
        FID NAME_STR
----------- --------------------------------------------------------------------------------
          0 aaaa,cccc
          1 dddd,eeee
          2 66666,9999,7777
          3 8888
          6 HHHHH,KKKKK
         11 bbbb
         12 asdasfafsa
7 rows selected