SELECT LTRIM(' milk') FROM dual;
returns 'milk'
SELECT LTRIM(' milk', ' ') FROM dual;
returns 'milk'
SELECT LTRIM('000123', '0') FROM dual;
returns '123'
SELECT LTRIM('123123milk'', '123') from dual;
returns 'milk'
select ltrim('123123milk123', '123') from dual;
returns 'milk123'