开发同事提出需求inserttime和audittime是varchar字段类型，计算出audittime与inserttime之间的差值，显示为hh:mm:ss格式，
而sqlserver datediff没有这种格式，特写函数转换了一下。
create function [dbo].[sumtime](@string1 varchar(40),@string2 varchar(40)) returns varchar(4000) as begin declare @str varchar(150) if len(cast(floor(datediff(ss,cast(@string1 as datetime),cast(@string2 as datetime))/3600) as varchar(4)))=1 set @str='0'+cast(floor(datediff(ss,cast(@string2 as datetime))/3600) as varchar(4)) else set @str=cast(floor(datediff(ss,cast(@string2 as datetime))/3600) as varchar(4)) if len(cast(datediff(ss,cast(@string2 as datetime))/60%60 as varchar(4)))=1 set @str=@str+':0'+cast(datediff(ss,cast(@string2 as datetime))/60%60 as varchar(4)) else set @str=@str+':'+cast(datediff(ss,cast(@string2 as datetime))/60%60 as varchar(4)) if len(cast(datediff(ss,cast(@string2 as datetime))%60 as varchar(4)))=1 set @str=@str+':0'+cast(datediff(ss,cast(@string2 as datetime))%60 as varchar(4)) else set @str=@str+':'+cast(datediff(ss,cast(@string2 as datetime))%60 as varchar(4)) return @str end
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