CREATE EXTENSION "soundex-operator";
-- john and joan should be equal
SELECT soundex_eq('john', 'joan');
 soundex_eq 
------------
 t
(1 row)

-- bob and shirley should not
SELECT soundex_eq('john', 'shirley');
 soundex_eq 
------------
 f
(1 row)

-- and the inverse of each
SELECT soundex_ne('john', 'joan');
 soundex_ne 
------------
 f
(1 row)

SELECT soundex_ne('john', 'shirley');
 soundex_ne 
------------
 t
(1 row)

-- those should translate into the operators
SELECT 'john' >@@< 'joan';
 ?column? 
----------
 t
(1 row)

SELECT 'john' >@@< 'shirley';
 ?column? 
----------
 f
(1 row)

SELECT 'john' <@@> 'joan';
 ?column? 
----------
 f
(1 row)

SELECT 'john' <@@> 'shirley';
 ?column? 
----------
 t
(1 row)