计算MySQL中两个日期时间之间的差异
问题描述：
我将MySQL的上次登录时间存储在datetime类型的字段中.当用户登录时，我想获取上次登录时间与当前时间(使用NOW()获得的时间)之间的时差.
I am storing the last login time in MySQL in, datetime-type filed. When users logs in, I want to get the difference between the last login time and the current time (which I get using NOW()).
如何计算?
答
USE TIMESTAMPDIFF MySQL function. For example, you can use:
SELECT TIMESTAMPDIFF(SECOND, '2012-06-06 13:13:55', '2012-06-06 15:20:18')
在您的情况下，TIMSTAMPDIFF函数的第三个参数将是当前登录时间(NOW()).第二个参数是上次登录时间，该时间已在数据库中.
In your case, the third parameter of TIMSTAMPDIFF function would be the current login time (NOW()). Second parameter would be the last login time, which is already in the database.