Fetching rows added last hour

问题

I keep a record of logins in a table. I have columns for id, ip, date and time. From that record of logins I wanna fetch logins made only in the last hour.

I'm sweeping through the MySQL docs on time and date functions, but I just can't seem to combine them correctly.

Can somebody help me?

回答1:

Make use of the DATE_SUB() and Now() functions:

select count(*) as cnt
from  log
where date >= DATE_SUB(NOW(),INTERVAL 1 HOUR);

Hope it helps you : )

回答2:

If you want to implement this into a cronjob, you need to specify the start and end.

For example, at 2pm, if you want to get the data for the past hour from 13:00:00 until 13:59:59, here's how to do it:

dateField BETWEEN 
DATE_FORMAT(DATE_SUB(NOW(), INTERVAL 1 HOUR), '%Y-%m-%d %H:00:00') 
AND 
DATE_FORMAT(DATE_SUB(NOW(), INTERVAL 1 HOUR), '%Y-%m-%d %H:59:59')

回答3:

I recommend have one datetime column instead of date and time columns.

Suppose you have a datetime column called last_login:

SELECT id, ip_address, last_login
FROM mytable
WHERE last_login >= DATE_SUB(NOW(), interval 1 hour);

回答4:

it can be done easily using

select count(*) from logins where datetime>= NOW()- INTERVAL 1 HOUR

回答5:

You can also use CURDATE()function

SELECT
    count(*) AS TotalCount
FROM
    tblName
WHERE
    datetime >= DATE_SUB(CURDATE(), INTERVAL 1 HOUR)

回答6:

without the specifics, I think Date_Add() would work.. by adding to your where clause an add of NOW negative hours

(or Date_Sub() )

来源：https://stackoverflow.com/questions/3681345/fetching-rows-added-last-hour

标签

mysql

datetime

date-range