Splitting data in one row and inserting into seperate rows into a new table

Question

i have a table table1 like the following
column1     column2          column3
a     b,cbdm,d     hj
ba     hello          man
i have to insert data from this table to table2 in the following format
Column1          column2          column3
a          b          hj
a          cbdm          hj
a          d          hj
ba          hello          man
It is like if data in column2 is seperated by comma i have to insert it into each sperate row
I have to write a single procedure which will do the above. Please,Please help me
I am very new to SQL

Answer 1

I am absolutely agreeing with Billy.
But I think u will be able to learn a lot if u try to understand the following code
sql>select * from t1;
     C1 C2 C3
     a  b,cdbm,d  hj 
     ba  hello  man 
     x  aa,d,df  yy 
sql>select * from t2;
     no rows selected
sql>insert into t2
      select col1,col2,col3
     from (
     select t1.c1 col1,t1.c2 col4,t1.c3 col3,
     substr(t1.c2,
              case n when 1 then 1 else instr(t1.c2,',',1,n-1)+1 end,
                   (case instr(t1.c2,',',1,n) when 0 then length(t1.c2)+1 else instr(t1.c2,',',1,n) end) -
                  (case n when 1 then 1 else instr(t1.c2,',',1,n-1)+1 end)) col2,n
       from t1,(select c1,c2,c3,
                          row_number() over(partition by c1,c2,c3 order by c1) n
                  from t1 connect by level <=
                                               (length(t1.c2)-length(replace(t1.c2,',','')))) t2
       where t1.c1 = t2.c1)
     where not(n != 1 and col4=col2);
sql>select * from t2;
      C1 C2 C3
      a  b  hj 
      a  cdbm  hj 
      a  d  hj 
      ba  hello  man 
      x  aa  yy 
      x  d  yy 
      x  df  yy