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Mysql custom fucntion is a very prety and intresting concept. In this posts i want to create one custom mysql function for remove numeric characters from table field value. this function through you can also remove numeric characters from string in mysql. in following sql query fire in your mysql or mssql database and check how it works. So, lets create function and how to use in select statement in sql query.

Create removeNumber function:

DROP FUNCTION IF EXISTS removeNumber; 
DELIMITER | 
CREATE FUNCTION removeNumber( str CHAR(32) ) RETURNS CHAR(16) 
BEGIN 
  DECLARE i_val, len SMALLINT DEFAULT 1; 
  DECLARE ret CHAR(32) DEFAULT ''; 
  DECLARE c CHAR(1); 
  SET len = CHAR_LENGTH( str ); 
  REPEAT 
    BEGIN 
      SET c = MID( str, i_val, 1 ); 
      IF c REGEXP '[[:alpha:]]' THEN 
        SET ret=CONCAT(ret,c); 
      END IF; 
      SET i_val = i_val + 1; 
    END; 
  UNTIL i_val > len END REPEAT; 
  RETURN ret; 
END | 
DELIMITER ; 

Use With Select Query:

SELECT removeNumber(users.name) FROM `users`

I hope it can help you...