SQL 請幫我指出錯誤

請問我該怎麼修改= =?

可以的話順便解釋一下@@

請同時列出有相同的電話區域代碼的2位作者代碼(au_id)以及2個電話(phone),
只列出電話都是奇數的資料(注:請列出au_id,au_id,phone,phone)
(注:有7筆)
select a1.au_id,a2.au_id,a1.phone,a2.phone
from authors as a1 join authors as a2
     on a1.au_id = a2.au_id
where a1.au_id < a2.au_id
order by a1.au_id