sql计算两个日期时长

在此同时求点击：点击点击点击。。。

declare @Ageyear int

declare @Agemonth int
declare @Ageday int
set @Ageyear =datediff(year, @begin, @end)-
case when dateadd(year, datediff(year, @begin, @end), @begin)> @end
then 1 else 0 end
set @Agemonth=ltrim(datediff(month, @begin, @end)-
case when dateadd(month,datediff(month, @begin, @end),@begin)> @end
then 1 else 0 end)-12*@Ageyear
if(day(@begin)<day(@end) or day(@begin)=day(@end))
set @Ageday=day(@end)-day(@begin)
else
set @Ageday=datediff(day,(ltrim(year(@end))+'-'
　　　　　 +ltrim(month(dateadd(mm,-1,@end)))+'-'+ltrim(day(@begin))),
(ltrim(year(@end))+'-'+ltrim(month(@end 


))+'-'+ltrim(day(@end))))
select ltrim(@Ageyear)+'年'+ltrim(@Agemonth)+'月'+ltrim(@Ageday)+'天'