1.显示本月第一天 SELECT DATEADD(mm,DATEDIFF(mm,0,getdate()),0) select convert(datetime,convert(varchar(8),getdate(), 120)+’01’,120) 2.显示本月最后一天 select dateadd(day,-1,convert(datetime,convert (varchar(8),dateadd(month,1,getdate()),120)+’01’,120)) SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(m,0,getdate())+1,0)) 3.上个月的最后一天 SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0)) 4.本月的第一个星期一i select DATEADD(wk,DATEDIFF(wk,0, dateadd(dd,6-datepart( day,getdate()),getdate())),0) 5.本年的第一天 SELECT DATEADD(yy,DATEDIFF(yy,0,getdate()),0) 6.本年的最后一天 SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate())+1,0)) 7.去年的最后一天 SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate()),0)) 8.本季度的第一天 SELECT DATEADD(qq,DATEDIFF(qq,0,getdate()),0) 9.本周的星期一 SELECT DATEADD(wk,DATEDIFF(wk,0,getdate()),0) 10.查询本月的记录 select * from tableName where DATEPART(mm, theDate) =DATEPART(mm, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE()) 11.查询本周的记录 select * from tableName where DATEPART(wk, theDate) = DATEPART (wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE()) 12.查询本季的记录 注：其中:GETDATE()是获得系统时间的函数。 select * from tableName where DATEPART(qq, theDate) = DATEPART (qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE()) 13.获取当月总天数: select DATEDIFF(dd,getdate(),DATEADD (mm, 1, getdate())) select datediff(day, dateadd(mm, datediff(mm,’’,getdate()), ’’), dateadd(mm, datediff(mm,’’,getdate()), ’1900-02-01’)) 14.获取当前为星期几 DATENAME(weekday, getdate())
