SQLServer right函数 从右侧截取指定位数的字符串

right(字段名,n)

sql从右侧截取字符串。n代表从右侧截取的位数。

SELECT RIGHT('123456', 4)
SELECT LEFT('123456', 4)

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举个栗子：

declare @starttime as datetime
declare @endtime as datetime
set @starttime = GETDATE()--'2018-06-19 17:08:02.000' 
set @endtime = '2018-06-20 17:08:02.000'

select right('00'+ cast(cast(datediff(ss ,@starttime,@endtime) / 3600 as int) as varchar),2) + ':' + 
right('00'+ cast(cast(datediff(ss ,@starttime,@endtime) % 3600 / 60 as int) as varchar),2) + ':' + 
right('00'+ cast(cast(datediff(ss ,@starttime,@endtime) % 60 as int) as varchar),2)