省略日期中的毫秒数
当我从 SQL Server 中选择时，我想获取一个日期，但省略了毫秒值，我希望它作为日期类型.因此，如果我有一个值 1/1/2009 1:23:11.923，我想省略毫秒但保留日期类型，以便它是值 1/1/2009 1:23:11.000(我知道你真的不能省略日期的毫秒值，只希望它为零).
When I select from SQL Server, I want to get a date, but omit the millisecond value, and I want it to be as a date type. So if I have a value 1/1/2009 1:23:11.923, I want to omit the millisecond but retain the date type, so that it will be the value 1/1/2009 1:23:11.000 (I know you really can't omit the millisecond value with a date, just want it to be zero).
SQL Server 中是否有函数可以执行此操作?还是我必须编写自己的函数?同样，我不希望它是 varchar 类型，而是 datetime 类型.
Is there a function in SQL Server to do this? Or do I have to write my own function? Again, I don't want it as a varchar type, but a datetime type.
推荐答案
如果你不想使用字符串转换，这里有一个解决方案:
If you don't want to use string conversions, here's a solution:
DECLARE @TheDate datetime, @Today datetime
SET @TheDate = GetDate()
SET @Today = DateAdd(dd, DateDiff(dd, 0, @TheDate), 0)
SELECT DateAdd(s, DateDiff(s, @Today, @TheDate), @Today)
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