查询所有本周，本月的数据

[SQLServer]
表名为：tableName
时间字段名为：theDate

查询本月的记录
select * from tableName where DATEPART(mm, theDate) = DATEPART(mm, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

查询本周的记录
select * from tableName where DATEPART(wk, theDate) = DATEPART(wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

查询本季的记录

select * from tableName where DATEPART(qq, theDate) = DATEPART(qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

查询3个月以内的数据

select * from tableName where datepart(dd,getdate() - theDate)<90

其中:GETDATE()是获得系统时间的函数。