Oracle 18c

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CREATE TABLE client (
    id            NUMBER(10,0)
                  GENERATED ALWAYS AS IDENTITY
                  CONSTRAINT client__id__pk PRIMARY KEY,
    password      CHAR(64)
                  NOT NULL,
    password_salt VARCHAR2(61)
                  NOT NULL
);
CREATE TRIGGER client_hash_trigger
BEFORE INSERT OR UPDATE ON client
FOR EACH ROW
BEGIN
  IF :new.PASSWORD = :old.PASSWORD THEN
    -- Assume things haven't changed (The chances of a hash collision are vanishingly small).
    -- Make sure the old salt is not replaced if the password hash hasn't changed.
    :new.PASSWORD_SALT := :old.PASSWORD_SALT;
  ELSE
    -- Regenerate a new salt and hash the password.
    :new.PASSWORD_SALT := DBMS_RANDOM.STRING( 'P', FLOOR( DBMS_RANDOM.VALUE( 40, 61 ) ) );
    SELECT STANDARD_HASH ( :new.PASSWORD_SALT || RTRIM( :new.PASSWORD ), 'SHA256' )
    INTO   :new.PASSWORD
    FROM   DUAL;
  END IF;
END;
/
INSERT INTO client (id, password) VALUES (DEFAULT, 'BruteForce');
1 rows affected

SELECT * FROM client;


ID
PASSWORD
PASSWORD_SALT


1
5159C490E4515EA9A63A92013C3BB011F5CEC4AFBD5A022DFC01B6A209F0AFC9
zTUS&e}"/veda=vx3w{lmTz0xcI#J'\MU|mO4b%u|&M|kLs3A(bt:"}t9


DROP TRIGGER client_hash_trigger;
DROP TABLE CLIENT;
CREATE TABLE client (
    id            NUMBER(10,0)
                  GENERATED ALWAYS AS IDENTITY
                  CONSTRAINT client__id__pk PRIMARY KEY,
    password      CHAR(64)
                  NOT NULL
);
CREATE OR REPLACE TRIGGER client_hash_trigger
BEFORE INSERT ON client
FOR EACH ROW
BEGIN
  SELECT STANDARD_HASH( RTRIM( :new.PASSWORD ), 'SHA256' )
  INTO   :new.PASSWORD
  FROM   DUAL;
END;
/
INSERT INTO client (id, password) VALUES (DEFAULT, 'BruteForce');
1 rows affected

SELECT id, password FROM client;


ID
PASSWORD


1
6BAFE79E0E7360094A490C0B84F2D5BA1C5A6E5C6FE1E45C2E7850966698AF29