Probably yes,It looks like comment - it informs database how process queryfor ex.SELECT /*+ LEADING(e2 e1) USE_NL(e1) INDEX(e1 emp_emp_id_pk) USE_MERGE(j) FULL(j) */ e1.first_name, e1.last_name, j.job_id, sum(e2.salary) total_sal FROM employees e1, employees e2, job_history j WHERE e1.employee_...