PostgreSQL RANK（）函数通过聚合列

Question

我构建了相当复杂的查询，我试图用他们的排名加载用户的聚合点。我发现RANK（）函数可以帮助我实现这一目标，但无法使其正常工作。

这里是没有RANK的查询：

SELECT users.*, SUM(received_points.count) AS pts 
FROM users 
LEFT JOIN received_points ON received_points.user_id = users.id AND ...other joining conditions... 
GROUP BY users.id 
ORDER BY pts DESC NULLS LAST

现在我想选择排名 - 但这种方式使用RANK功能它不起作用：

SELECT users.*, SUM(received_points.count) AS pts, 
    RANK() OVER (ORDER BY pts DESC NULLS LAST) AS position
FROM users 
LEFT JOIN received_points ON received_points.user_id = users.id AND ...other joining conditions... 
GROUP BY users.id 
ORDER BY pts DESC NULLS LAST

它告诉：PG::UndefinedColumn: ERROR: column "pts" does not exist

我想我得到了窗口函数的整个概念错误。如何选择按上面示例中的pts等聚合值排序的用户排名？

我知道我之后可以手动分配排名，但是如果我还想根据查询中的users.name过滤行，并且仍然可以获得用户的排名（未过滤）排行榜。 。？不知道我是否清楚......