SELECT t.title,avg(s.salary) FROM titles t INNER JOIN salaries s on t.emp_no=s.emp_no GROUP BY t.title ORDER BY avg(s.salary)
关键:用内连接将两个表连在一起,注意内连接的连接条件用ON
SELECT t.title,avg(s.salary) FROM titles t INNER JOIN salaries s on t.emp_no=s.emp_no GROUP BY t.title ORDER BY avg(s.salary)
关键:用内连接将两个表连在一起,注意内连接的连接条件用ON