koos808

기본 조회 및 필터링1.SELECT: 데이터 조회SELECT column1, column2 FROM table_name;SELECT * FROM table_name;2.WHERE: 조건 필터링SELECT * FROM employees WHERE department_id = 10;3.AND, OR: 복합 조건SELECT * FROM employees WHERE salary > 5000 AND department_id = 20;4.IN: 여러 값 중 일치하는 경우SELECT * FROM employees WHERE department_id IN (10, 20, 30);5.BETWEEN: 범위 조건SELECT * FROM employees WHERE salary BETWEEN 3000 AND 5000;6.LI..