SQL help, how to split one row into many rows

Question

Hi,
I got a question on SQL. One table, structure like this: (2 columns)
A 123,456,789
B 012,345
C 678,901,234
How to get the final result like below:
A 123,
A 456,
A 789
B 012,
B 345,
C 678,
C 901,
C 234
Do I have to use PL/SQL? Appreciate any thought you have on it!

Answer 1

i doubt the second column string operation can be acheived within single query to break it into rows.
but here is the pl/sql to do it.
SQL> create table test_data(col1 varchar2(5), col2 varchar2(30))
  2  /
Table created.
SQL> insert into test_data values('A','123,456,789')
  2  /
1 row created.
SQL> insert into test_data values('B','012,345')
  2  /
1 row created.
SQL> insert into test_data values('C','678,901,234')
  2  /
1 row created.
SQL>
SQL> set serveroutput on
SQL>
SQL> declare
  2    pos   number:=0;
  3    str   test_data.col2%type;
  4  begin
  5    for i in (select col1, col2 from test_data)
  6    loop
  7      str := i.col2||',';
  8      loop
  9        pos := instr(str, ',');
10        dbms_output.put_line(i.col1||' '||substr(str, 1, pos-1));
11        str := substr(str, pos+1);
12        exit when str is null;
13      end loop;
14    end loop;
15  end;
16  /
A 123                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
A 456                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
A 789                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
B 012                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
B 345                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
C 678                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
C 901                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
C 234                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
PL/SQL procedure successfully completed.