[ORACLE] 프로젝션
oracle 프로젝션 select * from hr.departments; select department_id, department_name, manager_id, location_id from hr.departments; select * from hr.employees; select employee_id, first_name, hire_date, salary, salary*12, salary+300 from hr.employees; ----직원의 사원번호, 이름, 입사일, 급여, 급여에 300을 더한것에 연봉까지 출력!!----- select employee_id, first_name, hire_date, salary, salary+300, (salary+300)*12 from hr.employees..
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