SELECT s1.emp_no,( s1.salary - e1.salary ) AS growth FROM# 查询当前工资 ( SELECT emp_no, salary FROM salaries WHERE to_date = '9999-01-01' ) AS s1 # 内连接2次查询结果 INNER JOIN # 查询入职时候的工资 ( SELECT s.emp_no, s.salary FROM salaries AS s INNER JOIN employees AS e ON s.emp_...