replace(string, target, replacement)
select replace('hello world', 'world', 'there') >> 결과 : hello there
sellect replace(job_id, 'engineer', '엔지니어') from employees >> 결과 : 엔지니어
sellect replace(replace(job_id, 'engineer', '엔지니어'), 'desinger', '디자이너') from employees