[打卡]mcg--多表查询

SELECT employee_id,last_name,department_name,city
FROM employees e,departments d,locations l
WHERE e.department_id=d.department_id
AND d.location_id=l.location_id;

SELECT * FROM job_grades;

SELECT e.last_name,e.salary,j.grade_level
FROM employees e,job_grades j
WHERE e.salary BETWEEN j.lowest_sal
AND j.highest_sal;

SELECT * FROM employees;

SELECT e.last_name,e.salary,j.grade_level
FROM employees e,job_grades j
WHERE e.salary >= j.lowest_sal
AND e.salary <= j.highest_sal;

SELECT * FROM employees;

SELECT emp.employee_id,emp.last_name,mgr.employee_id,mgr.last_name
FROM employees emp,employees mgr
WHERE emp.manager_id = mgr.employee_id;