check if “it's a number” function in Oracle

Question

I\'m trying to check if a value from a column in an oracle (10g) query is a number in order to compare it. Something like:

select case when ( is_number(myTab         


        

Answer 1

You can use the regular expression function 'regexp_like' in ORACLE (10g)as below:

select case
       when regexp_like(myTable.id, '[[:digit:]]') then
        case
       when myTable.id > 0 then
        'Is a number greater than 0'
       else
        'Is a number less than or equal to 0'
     end else 'it is not a number' end as valuetype
from table myTable