SQLServer自定义函数:fnDateInterval

王朝mssql·作者佚名  2006-11-24
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/*****************************************

** File: fnDateInterval.sql

** Name: fnDateInterval

** Description: Get the interval between the start date and the end date.

Use the format as "Number Years and Number Months and Number Days" to express the interval

取得两个时间的间隔,用“XX年XX月XX日”来表示。

** Return values: varchar(100)

** Parameters: @dtmStart,@dtmEnd

** Author: 何毅翔(MyGodness)

** Date: 2005-3-31

** Use Method: select dbo.fnDateInterval('2005-2-18','2005-4-6')

**************************************/

Create function fnDateInterval(@dtmStart datetime,@dtmEnd datetime)

returns varchar(100)

As

Begin

declare @chvInterval varchar(100)

select @chvInterval=convert(varchar(10),@dtmStart,120)+'距离'+convert(varchar(10),@dtmEnd,120)

--如果开始日期晚于结束日期

declare @dtmTemp datetime

if @dtmStart>@dtmEnd

select @dtmTemp=@dtmStart,@dtmStart=@dtmEnd,@dtmEnd=@dtmTemp,@chvInterval=@chvInterval+'已经过了'

else

select @chvInterval=@chvInterval+'还有'

declare @y int,@m int,@d int

select @y=datediff(yy,@dtmStart,@dtmEnd)

if datediff(d,dateadd(yy,@y,@dtmStart),@dtmEnd)<=0

select @y=@y-1

select @m=datediff(m,@dtmStart,@dtmEnd)-@y*12-1

declare @dtmStart2 datetime --开始日期下个月的第一天

declare @dtmEnd2 datetime --结束日期当月的第一天

select @dtmStart2=dateadd(mm,datediff(mm,0,@dtmStart)+1,0)

select @dtmEnd2=dateadd(mm,datediff(mm,0,@dtmEnd),0)

select @d=datediff(d,@dtmStart,@dtmStart2)-datediff(d,@dtmEnd,@dtmEnd2)

declare @dtmDaysOfStart int --开始日期当月的天数

select @dtmDaysOfStart=datediff(d,dateadd(mm,datediff(mm,0,@dtmStart),0),dateadd(mm,datediff(mm,0,@dtmStart)+1,0))

declare @dtmDaysOfEnd int --结束日期当月的天数

select @dtmDaysOfEnd=datediff(d,dateadd(mm,datediff(mm,0,@dtmEnd),0),dateadd(mm,datediff(mm,0,@dtmEnd)+1,0))

if @dtmDaysOfStart<=@d

select @d=@d-@dtmDaysOfStart,@m=@m+1

if @m=12

select @m=0,@y=@y+1

declare @chvY varchar(20),@chvM varchar(20),@chvD varchar(20)

if @y=0

select @chvY=''

else

select @chvY=cast(@y as varchar)+'年'

if @m=0

select @chvM=''

else

select @chvM=cast(@m as varchar)+'个月'

if @d=0

select @chvD=''

else

select @chvD=cast(@d as varchar)+'天'

if @y=0 and @m=0 and @d=0

select @chvD='0天'

select @chvInterval=@chvInterval+@chvY+@chvM+@chvD

return @chvInterval

End

 
 
 
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