如何计算PostgreSQL中的DATE差异？ [英] How to calculate DATE Difference in PostgreSQL?

问题描述

在这里，我需要计算 PostgreSQL 中两个日期的差。

Here I need to calculate the difference of the two dates in the PostgreSQL.

在SQL Server中：就像我们在 SQL Server 中所做的那样，<

In SQL Server: Like we do in SQL Server its much easier.

DATEDIFF(Day, MIN(joindate), MAX(joindate)) AS DateDifference;

我的尝试：我正在尝试使用以下脚本：

My Try: I am trying using the following script:

(Max(joindate) - Min(joindate)) as DateDifference;

问题：

• 我的方法正确吗？

• Is my method correct?

PostgreSQL中是否有任何功能 code>来计算这个？

Is there any function in PostgreSQL to calculate this?

推荐答案

您的计算正确表示 DATE 类型，但是如果您的值是时间戳，则应该使用 EXTRACT （或DATE_PART）以确保仅获得整天天；

Your calculation is correct for DATE types, but if your values are timestamps, you should probably use EXTRACT (or DATE_PART) to be sure to get only the difference in full days;

EXTRACT(DAY FROM MAX(joindate)-MIN(joindate)) AS DateDifference

要测试的SQLfiddle 。请注意，时间戳记差异要比整整2天少1秒。

An SQLfiddle to test with. Note the timestamp difference being 1 second less than 2 full days.

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