如何计算 mysql 中的日期和当前日期之间的差异

Question

我有一个名为“testing_tables”的 table，假设当前日期是 2022-03-01，1 个月 = 30 天。

我正在努力实现以下结果：

ip	founded	pid	aging_days
192.168.1.1	2022-01-1	1111	90 days
192.168.1.2	2022-01-1	2222	90 days
192.168.1.3	2022-01-1	3333	60 days
192.168.1.4	2022-03-1	4444	0 days

基本上，我想尝试计算第一个IP创建的天数，然后自动计算天数。然后仅显示 1 个 IP 和 pid，并具有以下老化天数。 Mysql 版本：8.0+

新说明：如果IP 192.168.1.3在3月份没有显示，我还有一些逻辑问题，天数仍然继续，只需要显示60天如下table

Answer 1

试试这个

SELECT 
    ip, MIN(founded) founded, pid, DATEDIFF(CURRENT_TIMESTAMP(), MIN(founded)) aging_days
FROM testing_tables
GROUP BY ip, pid

Answer 2

select ip, min(founded) as founded, pid, DATEDIFF(CURRENT_DATE,min(founded)) as aging_days 
from testing_tables
group by pid
order by pid;

Answer 3

您可以尝试以下方法：

SELECT ip, MIN(founded) AS founded, pid, DATEDIFF(CURRENT_TIMESTAMP(), MIN(founded)) AS aging_days FROM testing_tables GROUP BY ip, pid ORDER BY ip

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