postgresql - 在 Postgres 中按天分组

Question

我是 Postgres 的新手。我有一个看起来像这样的表:

User
----
id (int)
createdOn (bigint)
isDeleted (boolean)

createdOn 表示从 EPOCH 开始的毫秒数。我试图计算每天创建了多少 isDeleted 标志为 0 的用户。我尝试了以下方法，但它不起作用:

SELECT date_trunc('day', u.createdOn) AS "Day" , count(*) AS "No. of users"
FROM User u
WHERE u.isDeleted = 0 
GROUP BY 1 
ORDER BY 1;

如何创建此查询？

谢谢!

Answer 1

你没有说什么不起作用，但我猜是 date_trunc 函数

select
    date_trunc('day', to_timestamp(createdOn)) as "Day",
    count(*) as "No. of users"
from User
where isDeleted = 0
group by 1
order by 1;