How to compare number and varchar?

Posted on 2009-05-02
Last Modified: 2012-06-22
Hi - I have  table 'a' with a NUMBER column (col1) that is of course always digits.  The other table 'b' has the same column (col1) that is VARCHAR2 of 10 chars.  
The b.col1 could be: '',  '  ', 'abc', '1234', '02345'...
The a.col1 could be:  1234, 0123, 02345.....

I need to select from these two tables where a.col1 = b.col1:
 select * from a, b where a.col1= b.col1

1. If I use to_char(a.col1) it would give me 2345 instead of 02345.
    So select * from a, b where to_char(a.col1)= trim(b.col1) would not return what I   want

2. select * from a, b where a.col1= trim(b.col1) would return the error invalid number as
    'abs' is not a number.

So I do need to get  only numbers from the columns b.col1.
Any solution?


Question by:JelaV
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24288921
what about:
 select * from a, b where TRIM(LEADING '0' FROM a.col1) = TO_CHAR(b.col1)

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Author Comment

ID: 24292982
So the question is: How to get numeric values from an alphanumeric column?
LVL 143

Accepted Solution

Guy Hengel [angelIII / a3] earned 500 total points
ID: 24293098
I use this function:_
create or replace FUNCTION GetNumber2(txt_IN IN varchar2)
	test NUMBER;
	res VARCHAR2(128);
  res := TRANSLATE ( txt_IN, '0123456789' , '          ');
  res := REPLACE( TRANSLATE ( txt_IN, res ,  ' ' ) , ' ', '');
  test := TO_NUMBER(res);
RETURN (test);
END GetNumber2;

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