SOUNDEX function
SOUNDEX converts a string to a code value.
Words with similar sounds have a similar code value.SOUNDEX is used to compare words that are spelled slightly
differently but sound basically the same.
The general format for this function is:
SOUNDEX(string)
SQL> SELECT SOUNDEX('bai') FROM dual;
SOUN
----
B000
SQL> SELECT SOUNDEX('bye') FROM dual;
SOUN
----
B000
SQL>
The following sql finds employee's name that has the similar sound of 'white'.
CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
ENAME VARCHAR2(10),
JOB VARCHAR2(9),
SAL NUMBER(7, 2),
DEPTNO NUMBER(2));
INSERT INTO EMP VALUES (1, 'SMITH', 'CLERK', 800, 20);
INSERT INTO EMP VALUES (2, 'ALLEN', 'SALESMAN', 1600, 30);
INSERT INTO EMP VALUES (3, 'WARD', 'SALESMAN', 1250, 30);
INSERT INTO EMP VALUES (4, 'JONES', 'MANAGER', 2975, 20);
INSERT INTO EMP VALUES (5, 'MARTIN','SALESMAN', 1250, 30);
INSERT INTO EMP VALUES (6, 'BLAKE', 'MANAGER', 2850, 30);
INSERT INTO EMP VALUES (7, 'CLARK', 'MANAGER', 2850, 10);
INSERT INTO EMP VALUES (8, 'SCOTT', 'ANALYST', 3000, 20);
INSERT INTO EMP VALUES (9, 'KING', 'PRESIDENT',3000, 10);
INSERT INTO EMP VALUES (10,'TURNER','SALESMAN', 1500, 30);
INSERT INTO EMP VALUES (11,'WHITE', 'CLERK', 1500, 20);
SQL> select ename from emp where soundex(ename) = soundex('whyte');
ENAME
----------
WHITE
SQL>