SOUNDEX
Syntax
SOUNDEX(str)
Description
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 in str
are ignored. All
international alphabetic characters outside the A-Z range are treated as
vowels.
Important: When using SOUNDEX(), you should be aware of the following details:
- This function, as currently implemented, is intended to work well with strings that are in the English language only. Strings in other languages may not produce reasonable results.
- This function implements the original Soundex algorithm, not the more popular enhanced version (also described by D. Knuth). The difference is that original version discards vowels first and duplicates second, whereas the enhanced version discards duplicates first and vowels second.
Examples
SOUNDEX('Hello'); +------------------+ | SOUNDEX('Hello') | +------------------+ | H400 | +------------------+
SELECT SOUNDEX('MariaDB'); +--------------------+ | SOUNDEX('MariaDB') | +--------------------+ | M631 | +--------------------+
SELECT SOUNDEX('Knowledgebase'); +--------------------------+ | SOUNDEX('Knowledgebase') | +--------------------------+ | K543212 | +--------------------------+
SELECT givenname, surname FROM users WHERE SOUNDEX(givenname) = SOUNDEX("robert"); +-----------+---------+ | givenname | surname | +-----------+---------+ | Roberto | Castro | +-----------+---------+
See Also
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.