SQL & PL/SQL

Hello experts,

I have two tables ...

     create table1
   (
     col1 varchar2(20)
    );
    
  create table2
    (
      col1 number(10)
    );  

  

with their data as below

          with table1 as
  (  select 'xx' col1 from dual union all 
     select 'yy' col1  from dual union all
     select '01' col1  from dual union all
     select '02' col1  from dual union all
     select '03' col1  from dual union all
     select '04' col1  from dual 
  ),table2 as 
   (
     select '01' col1 from dual union all
     select '02' col1 from dual union all
     select '03' col1 from dual union all
     select '04' col1 from dual 
    )
      
    

My question
how would i join table1.col1 to table2.col1?? since they are different data types ....i tried to use To_char but then i got 0 zero's,
is ther is any functions i can use ??


Thank you!!