Query or Loop

Question

Hi,
I need help or suggestions in writing a pl/sql loop query against the data in Table A in order to get the output of Table B.
Table A               
id     type     valu     
1     a     x     
1     a     y     
1     a     x     
1     b     3     
1     c     33     
2     a     x     
2     b     55     
2     c     33     
The output should be inserted in a new table.The expected output
Table B output               
id     list_a     List_B     List_C
1     x,y,x     3     33
2     x     55     33
Thanks

Answer 1

Try this
SQL> with t
  2  as
  3  (
  4  select 1 id, 'a' type, 'x' value from dual union all
  5  select 1 id, 'a' type, 'y' value from dual union all
  6  select 1 id, 'a' type, 'x' value from dual union all
  7  select 1 id, 'b' type, '3' value from dual union all
  8  select 1 id, 'c' type, '33' value from dual union all
  9  select 2 id, 'a' type, 'x' value from dual union all
10  select 2 id, 'b' type, '55' value from dual union all
11  select 2 id, 'c' type, '33' value from dual
12  )
13  select id, max(decode(type, 'a', value)) list_a, max(decode(type, 'b', value)) list_b, max(decode(type, 'c', value)) list_c
14    from (
15            select id, type, max(value) value
16              from (
17                      select id, type, ltrim(sys_connect_by_path(value, ','),' ,') value
18                        from (
19                               select t.*, row_number() over(partition by id, type order by 1) rno
20                                 from t
21                             )
22                       start with rno = 1
23                      connect by rno = prior rno + 1
24                         and id = prior id
25                         and type = prior type
26                   )
27             group by id, type
28         )
29   group by id
30  /
        ID LIST_A     LIST_B     LIST_C
         1 x,y,x      3          33
         2 x          55         33
SQL>