SQL Server 2014如何DATEDIFF()函数截取对应时间年月日

4.1 定义和用法: DATEDIFF()函数返回两个日期之间的时间

4.2 语法

DATEDIFF(datepart,startdate,enddate)

datepart值: year | quarter | month | week | day | hour | minute | second

startdate:开始日期

enddate:结束日期

GetDate()获取系统当前时间

4.3  DATEDIFF截取时间示例

查询今天
        SELECT * FROM tablename where DATEDIFF(day,inputdate,GETDATE())=0

查询昨天
        SELECT * FROM tablename where DATEDIFF(day,inputdate,GETDATE())=1

查询本周
         SELECT * FROM tablename where datediff(week,inputdate,getdate())=0

查询上周
         SELECT * FROM tablename where datediff(week,inputdate,getdate())=1

查询本月
         SELECT * FROM tablename where DATEDIFF(month,inputdate,GETDATE())=0

查询上月
         SELECT * FROM tablename where DATEDIFF(month,inputdate,GETDATE())=1