Question

让我们说这是我的表：

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

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

我想找到两位演员参与的电影的标题actor_id = 22 and actor_id = 23 怎么写查询？

我试过了：

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

我相信以下查询应该适合你。

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;

联接也是处理它的更好方法：

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

如果你内部加入演员表两次，并在每个连接中设置个人actor_id作为标准，则需要两个演员都在电影中。因此，您只会返回同时拥有演员的电影。

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

如何找到在mysql中有2个演员的电影片名？

2 个答案: