SQL语句中DATEDIFF()函数的用法

DATEDIFF ( datepart , startdate , enddate )释义：计算时间差；
datepare值：year | quarter | month | week | day | hour | minute | second | millisecond
startdate：开始日期
enddate ：结束日期
GetDate()：获取当前的系统日期

下面例子中表名为tablename,条件字段名为inputdate

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