通过连接表在原始 sql 中查找

Question

给定 3 张桌子。我需要构建 SQL 查询来找到两个演员一起最多的演员并列出标题 那些电影。按字母排序

https://www.db-fiddle.com/f/r2Y9CpH8n7MHTeBaqEHe9S/0

表film_actor

 Column     | Type                        | Modifiers
------------+-----------------------------+----------
actor_id    | smallint                    | not null
film_id     | smallint                    | not null

... 表演员

 Column     | Type                        | Modifiers
------------+-----------------------------+----------
actor_id    | integer                     | not null 
first_name  | character varying(45)       | not null
last_name   | character varying(45)       | not null

... 桌膜

 Column     | Type                        | Modifiers
------------+-----------------------------+----------
film_id     | integer                     | not null
title       | character varying(255)      | not null

... 所需的输出：

first_actor | second_actor | title
------------+--------------+--------------------
John Doe    | Jane Doe     | The Best Movie Ever

...

Answer 1

输入数据和预期结果会有所帮助。另外，请标记您正在使用的数据库。你可以试试下面的代码，看看它是否有效：

SELECT (a.first_name || ' ' || a.last_name) AS First_Actor,
       (b.first_name || ' ' || b.last_name) AS Second_Actor,
       c.title
FROM actor a
JOIN
  (SELECT a.actor_id AS first_actor,
          b.actor_id AS second_actor,
          a.film_id
   FROM film_actor a
   JOIN film_actor b ON a.film_id = b.film_id
   AND a.actor_id < b.actor_id) ab ON a.actor_id = ab.first_actor
JOIN actor b ON b.actor_id = ab.second_actor
JOIN film c ON c.film_id = ab.film_id