Sql 复杂的联接查询，使用多个group BY联接3个表

我有三张桌子：

推特： 喜欢： 和转发 我需要一个查询，该查询将选择所有推文，以及他们的喜欢和转发量。
我确实设法写了一个有效的查询，但我认为我把它复杂化了，我希望听到更简单的解决方案

您希望在加入之前进行聚合。假设

join

键是

post\u id

：

select t.*, l.likes, r.retweets
from tweets t left join
     (select post_id, count(*) as likes
      from likes
      group by post_id
     ) l
     on l.post_id = t.id left join
     (select post_id, count(*) as retweets
      from retweets
      group by post_id
     ) r
     on r.post_id = t.id;

---

示例数据和所需结果将有所帮助。请发布您的代码，这将是帮助您改进方法的有用起点。非常感谢

CREATE TABLE likes (
    username        VARCHAR(50) not null,
    timestamp       TIMESTAMP not null default current_timestamp,
    post_id         UUID not null,
    CONSTRAINT      likes_pk PRIMARY KEY (username, post_id),
    CONSTRAINT      likes_post_id_fk FOREIGN KEY (post_id) REFERENCES tweets(id)
);

CREATE TABLE retweets (
    username        VARCHAR(50) not null,
    timestamp       TIMESTAMP not null default current_timestamp,
    post_id         UUID not null,
    CONSTRAINT      retweets_pk PRIMARY KEY (username, post_id),
    CONSTRAINT      retweets_post_id_fk FOREIGN KEY (post_id) REFERENCES tweets(id)
);

select t.*, l.likes, r.retweets
from tweets t left join
     (select post_id, count(*) as likes
      from likes
      group by post_id
     ) l
     on l.post_id = t.id left join
     (select post_id, count(*) as retweets
      from retweets
      group by post_id
     ) r
     on r.post_id = t.id;