Missing Keyword in JOIN syntax

Question

I have searched the site before asking the question but havn't come across something related. I am sure this is a ridiculously basic error, i have only been studying Oracle SQL from 0 computer background for around 4 months. I am planning to take the 1z0-051 end of this month so going over all the chapters. In this clause I am trying to get the name, title, salary, department and city of employees who have a salary higher than the average salary of the lowest paid position (CLERK). I keep getting Missing Keyword though?

SELECT e.first_name,
  e.last_name,
  j.job_title,
  e.salary,
  d.department_name,
  l.city
FROM employees e
JOIN jobs j
WHERE salary >
  (SELECT AVG(salary) FROM employees WHERE job_id LIKE '%CLERK%'
  ) ON e.job_id = j.job_id
JOIN departments d
ON e.department_id = d.department_id
JOIN locations l
ON d.location_id = l.location_id
ORDER BY salary

Answer 1

You have JOIN - WHERE - ON sequence which is wrong.

Should be something like this (assuming WHERE is not a part of your joining condition):

FROM employees e
JOIN jobs j ON e.job_id = j.job_id
....
....
WHERE e.salary >
  (SELECT AVG(salary) FROM employees WHERE job_id LIKE '%CLERK%')
ORDER BY ...

Answer 2

在where子句之后不能有join子句

Answer 3

FROM employees e JOIN jobs j << you are missing the "ON" clause between employees and jobs here>> WHERE salary

in addition, move the WHERE clause after all the JOINs.

select
      fields
   from
      table
         join
            join "ON" clause
         join
            join "ON" clause
   where
      some condition
   group by
      whatever grouping if aggregates
   order by
      if you want something certain order.