Sql 删除另一个出现一次的表中的值

我有以下表格：

movie_id  rent_id
1            1
2            2
2            3
3            3
3            4
3            5

rent_id  client_id  
   1         1
   2         1
   3         2
   4         4
   5         4    

我试图

删除第二个表中
电影id=2
的行，但前提是相应的
租金id
出现一次。例如，我想删除一部电影，如果租金仅基于这部电影，它应该在第二个表中删除，但在
租金_id=3
的情况下，我希望将其保留在表中，因为还有其他与之相关联的电影

我尝试的是：

delete 
from en_aluguel 
where id_aluguel = (select id_aluguel 
                    from re_aluguel_filme 
                    where id_filme = 2 havin count(*) = 1);

但结果并不是我想要的
你可以这样做：

DELETE FROM en_aluguel e
WHERE EXISTS (
    SELECT 1
    FROM (
        SELECT movie_id, rent_id, 
            COUNT(*) OVER (PARTITION BY rent_id) AS cnt
        FROM re_aluguel_filme
    ) r
    WHERE r.rent_id = e.rent_id
        AND r.movie_id = 2
        AND r.cnt = 1
);

在
中测试您必须有一个组才能使用having。希望这对你有用

DELETE FROM public.movies
    WHERE movie_id in (select movie_id 
                         from movies 
                         group by movie_id 
                         having count(*) >= 2);

你似乎想要：

delete from en_aluguel 
where id_aluguel in (select id_aluguel 
                     from re_aluguel_filme 
                     group by id_aluguel
                     having count(*) = 1 and    -- only one filrm
                            min(id_filme) = 2  -- and that is film "2"
                    );

那么你的预期结果是什么？