删除孤儿记录 - mysql

Question

I have following tables

question
-------------------
id | name

quiz_results
------------------
id|question_id|is_correct

Accidentally i deleted some question from the backend Note: I have used laravel framework and used model to maintain dependency. I havent used any relationship on database level. Now i need to remove the orphan records from quiz_results(ie i need to delete those records whose question was deleted accidentally)

I tried below

delete from quiz_results where id IN (SELECT qr.id
FROM  `quiz_results` qr
LEFT JOIN questions q ON ( q.id = qr.question_id ) 
WHERE q.id IS NULL )

it is giving following error

1093 - You can't specify target table 'quiz_results' for update in FROM clause

Earlier I also tried without subquery like below

delete from
FROM  `quiz_results` qr
LEFT JOIN questions q ON ( q.id = qr.question_id ) 
WHERE q.id IS NULL

which throw the syntax error

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM quiz_results qr LEFT JOIN questions q ON ( q.id = qr.question_id ) WH' at line 2

Answer 1

Try the follwing query:
DELETE FROM quiz_results WHERE question_id NOT IN (SELECT id FROM question)

Answer 2

Try this

delete from quiz_results r 
where not exists 
    (
        select 1 
        from question q 
        where q.id=r.question_id
    )

Answer 3

delete from FROM `quiz_results`

-->

delete `quiz_results` FROM  `quiz_results`