ASCIISTR takes a string argument and returns the ASCII equivalent. If any of the characters in the string are non ASCII, they are converted to the UTF-16xxxx format.
Syntax:
ASCIISTR(string)
Example:
SELECT ASCIISTR(‘a non-ascii char ŷ’ as RESULT FROM DUAL;
RESULT
————
a non-ascii char 0E7
Asciistr – Oracle SQL Function