相关疑难解决方法(0)

使用 Postgres 9.4，我有兴趣拥有一个整数数组，例如user_ids_who_like并提供一个用户数组（例如user_ids_i_am_following）来对该交集进行排序。

就像是：

select * 
from items 
where [there is an intersection between 
       user_ids_who_like with user_ids_i_am_following] 
order by intersection(user_ids_who_like).count

是否可以通过数组交集进行分组和排序？

示例数据：

items
name          | user_ids_who_like
'birds'       | '{1,3,5,8}'
'planes'      | '{2,3,4,11}'
'spaceships'  | '{3,4,6}'

对于给定的user_ids_who_i_follow = [3,4,11]，我可以执行以下操作：

select * from items
where <user_ids_who_like intersects with user_ids_who_i_follow>
order by <count of that intersection>

想要的结果：

name          | user_ids_who_like  | count
'planes'      |  '{2,3,4,11}'      | 3
'spaceships'  |  '{3,4,6}'         | 2
'birds'       |  '{1,3,5,8}'       | 1 …