SOUNDEX returns a phonetic representation of a string. You can use SOUNDEX to compare words which sounds similar, but are spelled different.
- For the computation of SOUNDEX the algorithm is used which is described in: Donald Knuth, The Art of Computer Programming, Vol. 3.
- The result is always a string with 4 characters (1 letter and 3 digits).
- This function is similar to COLOGNE_PHONETIC, which is more appropriate for German words.