查找所有已经分配部门的员工的信息
查找所有已经分配部门的员工的last_name和first_name以及dept_no
https://www.nowcoder.com/practice/6d35b1cd593545ab985a68cd86f28671
方法一: SELECT e.last_name, e.first_name, de.dept_no FROM employees AS e, dept_emp AS de WHERE de.emp_no = e.emp_no; 方法二: SELECT e.last_name, e.first_name, de.dept_no FROM employees AS e INNER JOIN dept_emp AS de ON de.emp_no = e.emp_no;