SELECT employee_id, last_name, job_id, department_id FROM employees WHERE department_id = 90 ;
SELECT last_name, salary FROM employees WHERE salary <= 3000;
SELECT last_name, salary FROM employees WHERE salary BETWEEN 2500 AND 3500; # WHERE salary>=2500 AND salary<=3500;
SELECT employee_id, last_name, salary, manager_id FROM employees WHERE manager_id IN (100, 101, 201); # 无顺序 # WHERE manager_id=100 OR manager_id=101 OR manager_id=201;
模糊查询