to join two columns with different data types

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 to join table1.col1 table2.col1? since they are different data types... .i tried to use To_char but then I got 0 zero,.
is there is all the functions I can use?


Thank you!!

user642297 wrote:
Hello experts,

I have two tables...

create table1
(
col1 varchar2(20)
);

create table2
(
col1 number(10)
);

with their data as below

Above, you said that table2.col1 was a NUMBER.
Below, is a VARCHAR2:

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
)

Woudn't be a better approximation of your real tables:

   ),table2 as
    (
      select 1 col1 from dual union all
      select 2 col1 from dual union all
      select 3 col1 from dual union all
      select 4 col1 from dual
     )

?

My question
How to join table1.col1 table2.col1? since they are different data types... .i tried to use To_char but then I got 0 zero,.
is there is all the functions I can use?

Your postal code. I think the best way is to use TO_CHAR, but maybe you were using it differently.

SELECT     *
FROM     table1
JOIN     table2     ON     NVL ( LTRIM (table1.col1, '0')
                   , '0'
                   )     = TO_CHAR (table2.col1)
;

This assumes that table1.col1 never contains decimal points, unary + signs, exhibitors, or other things like that.
He will be responsible for negative numbers, but if table1.col1 contains 0 in front after the sign less (for example '-0012' "), then the solution is a bit more complicated.

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