SOUNDEX ( string_expression )
- A character string or expression that contains a surname to be evaluated in simple Latin characters.
- A simple Latin character is one that does not have diacritical marks such as tilde (~) or acute accent (´).
- There are 26 uppercase simple Latin characters and 26 lowercase simple Latin characters.
- SOUNDEX is case insensitive.
- Embedded or trailing pad characters within character_string return an error to the requestor.