How to check the data that are not digital?

I have a varchar field and I would check for all of the lines where it does not contain a numeric value. How can I achieve this?
Thanks in advance.

One option is to write a small function

CREATE OR REPLACE FUNCTION is_numeric( p_str IN VARCHAR2 )
  RETURN NUMBER
IS
  l_num NUMBER;
BEGIN
  l_num := to_number( p_str );
  RETURN 1;
EXCEPTION
  WHEN others THEN
    RETURN 0;
END;

only then can you call

SELECT *
  FROM some_table
 WHERE is_numeric( some_string_column ) = 0

Of course, you can adapt the function to return the numeric value rather than a 1 or a 0 more.

Justin

Published by: Justin Cave on June 21, 2011 18:15

Depending on the version of Oracle (which you don't mention), you can also write a regular expression to search for things other than numbers. This can become a little difficult if you have to manage commas and dots as decimal separators and grouping because different regions use the symbols differently and have different rules about what are valid models.

Tags: Database

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