BEGIN;
CREATE EXTENSION IF NOT EXISTS anon CASCADE;
CREATE TABLE employee (
  firstname TEXT,
  lastname TEXT,
  phone TEXT,
  zipcode INTEGER
);
INSERT INTO employee VALUES ('Sarah','Connor','0609110911');
SELECT * FROM employee;
 firstname | lastname |   phone    | zipcode 
-----------+----------+------------+---------
 Sarah     | Connor   | 0609110911 |        
(1 row)

SECURITY LABEL FOR anon ON COLUMN employee.firstname
IS 'MASKED WITH VALUE ''XXXX'' ';
SECURITY LABEL FOR anon ON COLUMN employee.lastname
IS 'MASKED WITH VALUE $$REDACTED$$ ';
SECURITY LABEL FOR anon ON COLUMN employee.phone
IS 'MASKED WITH VALUE NULL ';
SECURITY LABEL FOR anon ON COLUMN employee.zipcode
IS 'MASKED WITH VALUE 100';
SELECT anon.anonymize_table('employee');
 anonymize_table 
-----------------
 t
(1 row)

SELECT count(*)=1
FROM anon.pg_masking_rules
WHERE masking_filter = '$$REDACTED$$';
 ?column? 
----------
 t
(1 row)

SELECT count(*)=1
FROM anon.pg_masking_rules
WHERE masking_filter = 'NULL';
 ?column? 
----------
 t
(1 row)

SELECT count(*)=1
FROM anon.pg_masking_rules
WHERE masking_filter = '100';
 ?column? 
----------
 t
(1 row)

ROLLBACK;