You can overload built-in functions that provide basic operations and certain text and time functions, including the following ones.
| abs() | trunc() | atan() | extend() |
| hex() | exp() | atan2() | decode() |
| mod() | log10() | length() | nvl() |
| pow() | logn() | char_length() | initcap() |
| root() | cos(), sin() | character_length() | lower() |
| round() | tan() | octet_length() | lpad(), rpad() |
| sqrt() | acos(), asin() | atan2() | upper() |