   SOUNDEX(str)
Returns a soundex string from str. Two strings that sound almost the
same should have identical soundex strings. A standard soundex string
is four characters long, but the SOUNDEX() function returns an
arbitrarily long string. You can use SUBSTRING() on the result to get
a standard soundex string.  All non-alphabetic characters are ignored in the
given string. All international alphabetic characters outside the A-Z range
are treated as vowels.
