我应该如何修改我的查询

Question

我使用下面的查询标识类别中最受欢迎的男演员（topActor）：

SELECT category_id AS cid, 
    (SELECT actor_id FROM 
film_actor JOIN film_category 
    ON film_actor.film_id = film_category.film_id 
     WHERE category_id = cid 
     GROUP BY actor_id 
     ORDER BY COUNT(*) DESC 
     LIMIT 0,1) AS topActor 
FROM film_actor JOIN film_category 
    ON film_actor.film_id = film_category.film_id 
GROUP BY category_id 


+-----+----------+ 
| cid | topActor | 
+-----+----------+ 
| 1 |  50 | 
| 2 |  150 | 
| 3 |  17 | 
| 4 |  86 | 
| 5 |  196 | 
| 6 |  48 | 
| 7 |  7 | 
| 8 |  79 | 
| 9 |  164 | 
| 10 |  68 | 
| 11 |  27 | 
| 12 |  108 | 
| 13 |  105 | 
| 14 |  107 | 
| 15 |  83 | 
| 16 |  44 | 
+-----+----------+ 
16 rows in set (0.00 sec) 

现在我需要获得相应的演员的FIRST_NAME和姓氏演员，含actor_id，姓氏和姓氏。我知道如何使用PL/SQL或SAS来完成它，但我是MySQL的新手。请帮忙！谢谢。

Answer 1

据我所知，你想从演员的表中获得fname和lname的值，而外键是actor_id，所以我认为这样做。

SELECT category_id AS cid, 
(SELECT actor_id FROM 
film_actor JOIN film_category 
ON film_actor.film_id = film_category.film_id 
    WHERE category_id = cid 
    GROUP BY actor_id 
    ORDER BY COUNT(*) DESC 
    LIMIT 0,1) AS topActor, actor.fname, actor.lname 
FROM film_actor inner JOIN film_category 
ON film_actor.film_id = film_category.film_id inner join actor on film_actor.actor_id = actor.id 
GROUP BY category_id 

我真的不明白什么是你的问题，因此，如果这个答案是错的，告诉我哪个部分。