specifies the character
that needs to be found in the ASCII collating sequence; this can be
specified as character constant, field name, or expression.
Restriction
If multiple characters are specified, only the first
character is used.
Details
See Appendix A: ASCII
Values for a complete list of ASCII values.
Example
ascii_value = asc("a") // outputs 97
character_content = chr(97) // outputs the letter "a"