我如何將這個「SELECT IN」更改爲MySQL的「EXISTS」查詢？

Question

SELECT au.* 
    FROM account au 
    WHERE au.id IN (
    SELECT fa.from_user_id 
     FROM approvals fa 
     WHERE fa.to_user_id = 1 
     GROUP BY fa.from_user_id 
    ) 
ORDER BY first_name ASC, last_name ASC 
LIMIT 0, 18446744073709551615; 

我該如何將此更改爲EXISTS而不是IN()？

Answer 1

SELECT au.* 
FROM account au 
WHERE EXISTS (
    SELECT 1 FROM approvals fa 
    WHERE fa.to_user_id=1 
    AND fa.from_user_id = au.id 
) 
ORDER BY first_name ASC, last_name ASC LIMIT 0, 18446744073709551615;