说法是，一般来说，JOIN的顺序不重要，除非你要自己定制driving table。
示例：
SELECT a.account_id, c.fed_id, e.fname, e.lname
-> FROM account AS a INNER JOIN customer AS c
-> ON a.cust_id = c.cust_id
-> INNER JOIN employee AS e
-> ON a.open_emp_id = e.emp_id
-> WHERE c.cust_type_cd = 'B';