sql - 申报日期与选定日期不匹配

Question

我声明了一个名为 @dt 的日期时间变量 -

declare @dt Datetime = '2019-01-29 11:06:31.095'

当我选择变量时，它给出了错误的日期

select @dt --it gives '2019-01-29 11:06:31.097'

Answer 1

根据manual :

datetime values are rounded to increments of .000, .003, or .007 seconds, as shown in the following table.

所提供链接中的表格清楚地说明了您的值从 '.095' 转换为 '.097' 的原因:

User-specified value    System stored value
-----------------------------------------------
01/01/98 23:59:59.999   1998-01-02 00:00:00.000
01/01/98 23:59:59.995

01/01/98 23:59:59.996

01/01/98 23:59:59.997

01/01/98 23:59:59.998   1998-01-01 23:59:59.997