CREATE DOMAIN ZIP_CODE CHAR(5) NOT NULL
    DEFAULT '00000'
      CHECK ( VALUE ~ '^[0-9]{5}$'
        AND ( ( VALUE = '00000' ) OR
        ( VALUE BETWEEN '00210' AND '99950'
          ) ) );

  CREATE TABLE contact_addresses (
    contact_id INT NOT NULL
      REFERENCES contacts(contact_id),
    ...
    state STATE_CODE,
    zip ZIP_CODE );

  CREATE INDEX idx_compensation 
    ON personnel( 
      (salary + bonus + commission) );
   Оптимально для SELECT в котором содержится (salary + bonus + commission)

   SELECT ARRAY[2 * 3, 4 * 5, 6 * 7];
   SELECT ARRAY[unique1, unique2, even]
   SELECT ARRAY['hello world','happy birthday'];

  ALTER TABLE companies 
  ADD COLUMN fti_business tsvector;

  UPDATE companies SET fti_business = to_tsvector('default',business_model);

  VACUUM FULL ANALYZE companies;

  CREATE INDEX idx_fti_business ON companies USING gist(fti_business);

  CREATE TRIGGER tg_fti_companies 
  BEFORE UPDATE OR INSERT ON companies
  FOR EACH ROW EXECUTE PROCEDURE
    tsearch2(fti_business, business_model);

  SELECT company_name, business_model
  FROM companies
  WHERE fti_business @@
    to_tsquery('default','bushing | engine');