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一,DATEDIFF 函数
SQL server 定义和用法
DATEDIFF() 函数返回两个日期之间的时间。
SQL server 语法:
DATEDIFF(datepart,startdate,enddate)
startdate :开始时间
enddate:结束时间
datepart:
示例:
SELECT DATEDIFF(mi,'2008-12-29','2008-12-30') AS DiffDate
结果:1440
MySQL 定义和用法
DATEDIFF() 函数返回两个日期之间的天数。
语法
DATEDIFF(date1,date2)
示例:
SELECT DATEDIFF('2008-12-30','2008-12-29') AS DiffDate
结果:1
SELECT DATEDIFF('2008-12-23 23:23:23','2008-12-29 12:12:12') AS DiffDate
结果:-6
不同之处:
* Mysql 返回的是天数。
* SQL server 返回的可以根据参数datepart 来转换。
使用下面的MySQL 语句对两个时间进行精确到分钟的时间差计算。
SELECT round((UNIX_TIMESTAMP('2008-12-30 23:22:23')-UNIX_TIMESTAMP('2008-12-30
12:02:10'))/60)