DB2- How to check if varchar field value has integers

Question

Is there an inbuilt DB2 function or any query to check if the character i have is a number? (I cannot use user defined functions)

Answer 1

Use ASCII function to get character value and compare that it is between 48 '0' and 57 '9'

ASCII Table

ASCII Function Returns the ASCII code value of the leftmost character of the argument as an integer.