Horizontal view query help

Question

Hi ,
I have a requirement that i have to display the report in horizontal format like
TABLE 1
1 xyz
2 abc
TABLE2
1 DXB
1 BOM
1 MAS
I need to show the output like
OUTPUT
1 xyz DXB-BOM-MAS
Could you please any one to help me to build the report query.
Thanks,
Venkataraman L

Answer 1

Without any Oracle Version, I would suggest below:
with table_1 as
  select 1 col1, 'xyz' col2 from dual union all
  select 2, 'abc' from dual
table_2 as
  select 1 col1, 'DXB' col2 from dual union all
  select 1 col1, 'BOM' col2 from dual union all
  select 1 col1, 'MAS' col2 from dual
data as
  select a.col1, a.col2 a_col2, b.col2 b_col,
         row_number() over(partition by a.col1 order by b.col2) curr
    from table_1 a join table_2 b
      on a.col1 = b.col1
select col1, a_col2,
       ltrim(max(sys_connect_by_path(b_col, ' - ')) keep (dense_rank last order by curr), ' - ') conn
  from data
start with curr = 1
connect by prior curr =  curr - 1
       and col1 = prior col1
       and a_col2 = prior a_col2
group by col1, a_col2;
COL1 A_COL2 CONN                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
   1 xyz    BOM - DXB - MASIf on Oracle 11g R2:
with table_1 as
  select 1 col1, 'xyz' col2 from dual union all
  select 2, 'abc' from dual
table_2 as
  select 1 col1, 'DXB' col2 from dual union all
  select 1 col1, 'BOM' col2 from dual union all
  select 1 col1, 'MAS' col2 from dual
data as
  select a.col1, a.col2 a_col2, b.col2 b_col
    from table_1 a join table_2 b
      on a.col1 = b.col1
select col1, a_col2,
       listagg(b_col, ' - ') within group (order by a_col2) conn
  from data
group by col1, a_col2;
COL1 A_COL2 CONN                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
   1 xyz    BOM - DXB - MAS