如何在mysql中找到具有2個演員的電影標題？

Question

可以說這是我的桌子：

************
* film     * 
************    
* title    *
* film_id  *
************

************    
* actors   *
************
* film_id  *
* actor_id *
************

我想找到兩個演員參與的電影的標題actor_id = 22 and actor_id = 23如何寫查詢？

我試過了 ：

SELECT title 
FROM film 
WHERE film_id IN(
    SELECT film_id, COUNT(*) 
    FROM actors 
    WHERE actor_id=22 OR actor_id=23
    GROUP BY film_id)

Answer 1

我相信以下查詢應該適合您。

SELECT title 
FROM film f, actors a1, actors a2 
WHERE f.film_id=a1.film_id AND a1.actor_id=22 
      AND f.film_id=a2.film_id AND a2.actor_id=23;

聯接也是一種更好的處理方式：

SELECT title 
FROM film f 
JOIN actors a1 ON f.film_id = a1.film_id
JOIN actors a2 ON f.film_id = a2.film_id
WHERE  a1.actor_id = 22 
       AND a2.actor_id = 23;

Answer 2

如果您兩次內部連接到actor表，並在每個連接中將單獨的actor_id設置為條件，則將要求兩個actor都在電影中。 因此，您只會返回同時擁有兩個演員的電影。

SELECT film.title 
FROM film 
INNER JOIN actors actors1
    ON film.film_id = actors1.film_id
    AND actors1.actor_id=22
INNER JOIN actors actors2 
    ON film.film_id = actors2.film_id
    AND actors2.actor_id=23
GROUP BY film.title