在SQL Server中，如何用其他值替换秒值？

Question

如何更换秒部分？

2016-07-07 16:46:23.057

我想用00代替23：

2016-07-07 16:46:00.057

Answer 1

set @new_value = dateadd(s, -datepart(s, @old_value), @old_value)

Answer 2

试试这个

DECLARE @Date datetime = '2016-07-07 16:46:23.057' 
DECLARE @NewSeconds int = 0 -- from 0 to 59 - what you want to replace the original seconds with
DECLARE @NewDate datetime

SET @NewDate = DATEADD(ss, @NewSeconds, DATEADD(ss, -DATEPART(ss, @Date), @Date))

SELECT @NewDate

Answer 3

select CONVERT(varchar(10),getdate(),121) +' ' + right('00'+cast(DATEPART(HOUR,getdate()) as varchar(4)),2)+ ':' + right('00'+cast(DATEPART(MINUTE,getdate()) as varchar(4)),2)+  ':00:' + right('000'+cast(DATEPART(MS,getdate()) as varchar(4)),3)